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diff --git a/toolkit/crashreporter/google-breakpad/src/google_breakpad/processor/source_line_resolver_base.h b/toolkit/crashreporter/google-breakpad/src/google_breakpad/processor/source_line_resolver_base.h
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+// Copyright (c) 2010 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// source_line_resolver_base.h: SourceLineResolverBase, an (incomplete)
+// implementation of SourceLineResolverInterface.  It serves as a common base
+// class for concrete implementations: FastSourceLineResolver and
+// BasicSourceLineResolver.  It is designed for refactoring that removes
+// code redundancy in the two concrete source line resolver classes.
+//
+// See "google_breakpad/processor/source_line_resolver_interface.h" for more
+// documentation.
+
+// Author: Siyang Xie (lambxsy@google.com)
+
+#ifndef GOOGLE_BREAKPAD_PROCESSOR_SOURCE_LINE_RESOLVER_BASE_H__
+#define GOOGLE_BREAKPAD_PROCESSOR_SOURCE_LINE_RESOLVER_BASE_H__
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "google_breakpad/processor/source_line_resolver_interface.h"
+
+namespace google_breakpad {
+
+using std::map;
+using std::set;
+
+// Forward declaration.
+// ModuleFactory is a simple factory interface for creating a Module instance
+// at run-time.
+class ModuleFactory;
+
+class SourceLineResolverBase : public SourceLineResolverInterface {
+ public:
+  // Read the symbol_data from a file with given file_name.
+  // The part of code was originally in BasicSourceLineResolver::Module's
+  // LoadMap() method.
+  // Place dynamically allocated heap buffer in symbol_data. Caller has the
+  // ownership of the buffer, and should call delete [] to free the buffer.
+  static bool ReadSymbolFile(const string &file_name,
+                             char **symbol_data,
+                             size_t *symbol_data_size);
+
+ protected:
+  // Users are not allowed create SourceLineResolverBase instance directly.
+  SourceLineResolverBase(ModuleFactory *module_factory);
+  virtual ~SourceLineResolverBase();
+
+  // Virtual methods inherited from SourceLineResolverInterface.
+  virtual bool LoadModule(const CodeModule *module, const string &map_file);
+  virtual bool LoadModuleUsingMapBuffer(const CodeModule *module,
+                                        const string &map_buffer);
+  virtual bool LoadModuleUsingMemoryBuffer(const CodeModule *module,
+                                           char *memory_buffer,
+                                           size_t memory_buffer_size);
+  virtual bool ShouldDeleteMemoryBufferAfterLoadModule();
+  virtual void UnloadModule(const CodeModule *module);
+  virtual bool HasModule(const CodeModule *module);
+  virtual bool IsModuleCorrupt(const CodeModule *module);
+  virtual void FillSourceLineInfo(StackFrame *frame);
+  virtual WindowsFrameInfo *FindWindowsFrameInfo(const StackFrame *frame);
+  virtual CFIFrameInfo *FindCFIFrameInfo(const StackFrame *frame);
+
+  // Nested structs and classes.
+  struct Line;
+  struct Function;
+  struct PublicSymbol;
+  struct CompareString {
+    bool operator()(const string &s1, const string &s2) const;
+  };
+  // Module is an interface for an in-memory symbol file.
+  class Module;
+  class AutoFileCloser;
+
+  // All of the modules that are loaded.
+  typedef map<string, Module*, CompareString> ModuleMap;
+  ModuleMap *modules_;
+
+  // The loaded modules that were detecting to be corrupt during load.
+  typedef set<string, CompareString> ModuleSet;
+  ModuleSet *corrupt_modules_;
+
+  // All of heap-allocated buffers that are owned locally by resolver.
+  typedef std::map<string, char*, CompareString> MemoryMap;
+  MemoryMap *memory_buffers_;
+
+  // Creates a concrete module at run-time.
+  ModuleFactory *module_factory_;
+
+ private:
+  // ModuleFactory needs to have access to protected type Module.
+  friend class ModuleFactory;
+
+  // Disallow unwanted copy ctor and assignment operator
+  SourceLineResolverBase(const SourceLineResolverBase&);
+  void operator=(const SourceLineResolverBase&);
+};
+
+}  // namespace google_breakpad
+
+#endif  // GOOGLE_BREAKPAD_PROCESSOR_SOURCE_LINE_RESOLVER_BASE_H__