Align base::hash_map with C++11.

chrome/browser/profiles/profile.h

Index: chrome/browser/profiles/profile.h
diff --git a/chrome/browser/profiles/profile.h b/chrome/browser/profiles/profile.h
index 87a4c5fd6c31906e0bcfbec6026d9a7c52d9360e..efc8083bf7b614b9deb17674e33e9a17da3673f2 100644
--- a/chrome/browser/profiles/profile.h
+++ b/chrome/browser/profiles/profile.h
@@ -405,17 +405,4 @@ struct ProfileCompare {
   bool operator()(Profile* a, Profile* b) const;
 };
 
-#if defined(COMPILER_GCC)
-namespace BASE_HASH_NAMESPACE {
-
-template<>
-struct hash<Profile*> {
-  std::size_t operator()(Profile* const& p) const {
-    return reinterpret_cast<std::size_t>(p);
-  }
-};
-
-}  // namespace BASE_HASH_NAMESPACE
-#endif
-
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_H_