Make platform/heap to use USING_FAST_MALLOC.

third_party/WebKit/Source/platform/heap/BlinkGCInterruptor.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 BlinkGCInterruptor_h
 #define BlinkGCInterruptor_h
 
 #include "platform/PlatformExport.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 // If attached thread enters long running loop that can call back
 // into Blink and leaving and reentering safepoint at every
 // transition between this loop and Blink is deemed too expensive
 // then instead of marking this loop as a GC safepoint thread
 // can provide an interruptor object which would allow GC
 // to temporarily interrupt and pause this long running loop at
 // an arbitrary moment creating a safepoint for a GC.
 class PLATFORM_EXPORT BlinkGCInterruptor {
+    USING_FAST_MALLOC(BlinkGCInterruptor);
 public:
     virtual ~BlinkGCInterruptor() { }
 
     // Request the interruptor to interrupt the thread and
     // call onInterrupted on that thread once interruption
     // succeeds.
     virtual void requestInterrupt() = 0;
 
 protected:
     // This method is called on the interrupted thread to
     // create a safepoint for a GC.
     void onInterrupted();
 };
 
 } // namespace blink
 
 #endif