Make platform/heap to use USING_FAST_MALLOC.

third_party/WebKit/Source/platform/fonts/FontCacheMemoryDumpProvider.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef FontCacheMemoryDumpProvider_h
 #define FontCacheMemoryDumpProvider_h
 
 #include "platform/PlatformExport.h"
 #include "public/platform/WebMemoryDumpProvider.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT FontCacheMemoryDumpProvider final : public WebMemoryDumpProvider {
+    USING_FAST_MALLOC(FontCacheMemoryDumpProvider);
 public:
     static FontCacheMemoryDumpProvider* instance();
     ~FontCacheMemoryDumpProvider() override { }
 
     // WebMemoryDumpProvider implementation.
     bool onMemoryDump(WebMemoryDumpLevelOfDetail, WebProcessMemoryDump*) override;
 
 private:
     FontCacheMemoryDumpProvider() { }
 };
 
 } // namespace blink
 
 #endif // FontCacheMemoryDumpProvider_h