Align base::hash_map with C++11.

content/common/host_shared_bitmap_manager.h

Index: content/common/host_shared_bitmap_manager.h
diff --git a/content/common/host_shared_bitmap_manager.h b/content/common/host_shared_bitmap_manager.h
index 5559a85f3eab78a43975973d925aa310754b849d..ec07b84f63782540dc01ac33de09593d0447e336 100644
--- a/content/common/host_shared_bitmap_manager.h
+++ b/content/common/host_shared_bitmap_manager.h
@@ -20,18 +20,12 @@
 #include "content/common/content_export.h"
 
 namespace BASE_HASH_NAMESPACE {
-#if defined(COMPILER_GCC)
 template <>
 struct hash<cc::SharedBitmapId> {
   size_t operator()(const cc::SharedBitmapId& id) const {
     return base::Hash(reinterpret_cast<const char*>(id.name), sizeof(id.name));
   }
 };
-#elif defined(COMPILER_MSVC)
-inline std::size_t hash_value(const cc::SharedBitmapId& id) {
-  return base::Hash(reinterpret_cast<const char*>(id.name), sizeof(id.name));
-}
-#endif  // COMPILER
 }  // namespace BASE_HASH_NAMESPACE
 
 namespace content {