Make classes and structures in core/frame fast-allocated.

Source/core/frame/RootFrameViewport.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 RootFrameViewport_h
 #define RootFrameViewport_h
 
 #include "core/CoreExport.h"
 #include "platform/scroll/ScrollableArea.h"
 
 namespace blink {
 
 class LayoutRect;
 
 // ScrollableArea for the root frame's viewport. This class ties together the
 // concepts of layout and visual viewports, used in pinch-to-zoom. This class
 // takes two ScrollableAreas, one for the visual viewport and one for the
 // layout viewport, and delegates and composes the ScrollableArea API as needed
 // between them. For most scrolling APIs, this class will split the scroll up
 // between the two viewports in accord with the pinch-zoom semantics. For other
 // APIs that don't make sense on the combined viewport, the call is delegated to
 // the layout viewport. Thus, we could say this class is a decorator on the
 // FrameView scrollable area that adds pinch-zoom semantics to scrolling.
 class CORE_EXPORT RootFrameViewport final : public NoBaseWillBeGarbageCollectedFinalized<RootFrameViewport>, public ScrollableArea {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(RootFrameViewport);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(RootFrameViewport);
 public:
     static PassOwnPtrWillBeRawPtr<RootFrameViewport> create(ScrollableArea& visualViewport, ScrollableArea& layoutViewport, bool invertScrollOrder = false)
     {
         return adoptPtrWillBeNoop(new RootFrameViewport(visualViewport, layoutViewport, invertScrollOrder));
     }
 
     DECLARE_VIRTUAL_TRACE();
 
     // ScrollableArea Implementation
@@ skipping 51 matching lines @@
     RawPtrWillBeMember<ScrollableArea> m_layoutViewport;
 
     // Experimental flag. If the experiment is enabled, scroll the visual viewport first,
     // the bubble scrolls to the layout viewport.
     bool m_invertScrollOrder;
 };
 
 } // namespace blink
 
 #endif // RootFrameViewport_h