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diff --git a/toolkit/crashreporter/google-breakpad/src/common/linux/safe_readlink.h b/toolkit/crashreporter/google-breakpad/src/common/linux/safe_readlink.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.
+
+// safe_readlink.h: Define the google_breakpad::SafeReadLink function,
+// which wraps sys_readlink and gurantees the result is NULL-terminated.
+
+#ifndef COMMON_LINUX_SAFE_READLINK_H_
+#define COMMON_LINUX_SAFE_READLINK_H_
+
+#include <stddef.h>
+
+namespace google_breakpad {
+
+// This function wraps sys_readlink() and performs the same functionalty,
+// but guarantees |buffer| is NULL-terminated if sys_readlink() returns
+// no error. It takes the same arguments as sys_readlink(), but unlike
+// sys_readlink(), it returns true on success.
+//
+// |buffer_size| specifies the size of |buffer| in bytes. As this function
+// always NULL-terminates |buffer| on success, |buffer_size| should be
+// at least one byte longer than the expected path length (e.g. PATH_MAX,
+// which is typically defined as the maximum length of a path name
+// including the NULL byte).
+//
+// The implementation of this function calls sys_readlink() instead of
+// readlink(), it can thus be used in the context where calling to libc
+// functions is discouraged.
+bool SafeReadLink(const char* path, char* buffer, size_t buffer_size);
+
+// Same as the three-argument version of SafeReadLink() but deduces the
+// size of |buffer| if it is a char array of known size.
+template <size_t N>
+bool SafeReadLink(const char* path, char (&buffer)[N]) {
+  return SafeReadLink(path, buffer, sizeof(buffer));
+}
+
+}  // namespace google_breakpad
+
+#endif  // COMMON_LINUX_SAFE_READLINK_H_