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diff --git a/toolkit/crashreporter/google-breakpad/src/tools/linux/md2core/minidump_memory_range.h b/toolkit/crashreporter/google-breakpad/src/tools/linux/md2core/minidump_memory_range.h
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+++ b/toolkit/crashreporter/google-breakpad/src/tools/linux/md2core/minidump_memory_range.h
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+// Copyright (c) 2011, 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.
+
+// minidump_memory_range.h: Define the google_breakpad::MinidumpMemoryRange
+// class, which adds methods for handling minidump specific data structures
+// on top of google_breakpad::MemoryRange. See common/memory_range.h for
+// more details on MemoryRange.
+
+#ifndef TOOLS_LINUX_MD2CORE_MINIDUMP_MEMORY_RANGE_H_
+#define TOOLS_LINUX_MD2CORE_MINIDUMP_MEMORY_RANGE_H_
+
+#include <string>
+
+#include "common/memory_range.h"
+#include "google_breakpad/common/minidump_format.h"
+
+namespace google_breakpad {
+
+// A derived class of MemoryRange with added methods for handling minidump
+// specific data structures. To avoid virtual functions, it is not designed
+// to be used polymorphically.
+class MinidumpMemoryRange : public MemoryRange {
+ public:
+  MinidumpMemoryRange() {}
+
+  MinidumpMemoryRange(const void* data, size_t length)
+      : MemoryRange(data, length) {}
+
+  // Returns a subrange of |length| bytes at |offset| bytes of this memory
+  // range, or an empty range if the subrange is out of bounds.
+  // This methods overrides the base implemementation in order to return
+  // an instance of MinidumpMemoryRange instead of MemoryRange.
+  MinidumpMemoryRange Subrange(size_t sub_offset, size_t sub_length) const {
+    if (Covers(sub_offset, sub_length))
+      return MinidumpMemoryRange(data() + sub_offset, sub_length);
+    return MinidumpMemoryRange();
+  }
+
+  // Returns a subrange that covers the offset and length specified by
+  // |location|, or an empty range if the subrange is out of bounds.
+  MinidumpMemoryRange Subrange(const MDLocationDescriptor& location) const {
+    return MinidumpMemoryRange::Subrange(location.rva, location.data_size);
+  }
+
+  // Gets a STL string from a MDString at |sub_offset| bytes of this memory
+  // range. This method only works correctly for ASCII characters and does
+  // not convert between UTF-16 and UTF-8.
+  const std::string GetAsciiMDString(size_t sub_offset) const {
+    std::string str;
+    const MDString* md_str = GetData<MDString>(sub_offset);
+    if (md_str) {
+      const uint16_t* buffer = &md_str->buffer[0];
+      for (uint32_t i = 0; i < md_str->length && buffer[i]; ++i) {
+        str.push_back(buffer[i]);
+      }
+    }
+    return str;
+  }
+};
+
+}  // namespace google_breakpad
+
+#endif  // TOOLS_LINUX_MD2CORE_MINIDUMP_MEMORY_RANGE_H_