Align base::hash_map with C++11.

gpu/command_buffer/service/async_pixel_transfer_manager.h

Index: gpu/command_buffer/service/async_pixel_transfer_manager.h
diff --git a/gpu/command_buffer/service/async_pixel_transfer_manager.h b/gpu/command_buffer/service/async_pixel_transfer_manager.h
index 1a818f3c1ad80a18a4da5ad42e6c9711c76ddfff..3517434d7e4f2f322c5c8638e372a4ea203e5d86 100644
--- a/gpu/command_buffer/service/async_pixel_transfer_manager.h
+++ b/gpu/command_buffer/service/async_pixel_transfer_manager.h
@@ -15,17 +15,6 @@
 #include "gpu/command_buffer/service/texture_manager.h"
 #include "gpu/gpu_export.h"
 
-#if defined(COMPILER_GCC)
-namespace BASE_HASH_NAMESPACE {
-template <>
-  struct hash<gpu::gles2::TextureRef*> {
-  size_t operator()(gpu::gles2::TextureRef* ptr) const {
-    return hash<size_t>()(reinterpret_cast<size_t>(ptr));
-  }
-};
-}  // namespace BASE_HASH_NAMESPACE
-#endif  // COMPILER
-
 namespace gfx {
 class GLContext;
 }