rAF: Introduce FrameRequestCallbackCollection for managing rAF callbacks.

Source/core/frame/LocalDOMWindow.cpp

Index: Source/core/frame/LocalDOMWindow.cpp
diff --git a/Source/core/frame/LocalDOMWindow.cpp b/Source/core/frame/LocalDOMWindow.cpp
index ddee0e9caaa4aa382c3d8fa1e211644706b544e6..75fb51282aab0252d026a8805894417860ea8cec 100644
--- a/Source/core/frame/LocalDOMWindow.cpp
+++ b/Source/core/frame/LocalDOMWindow.cpp
@@ -45,7 +45,7 @@
 #include "core/dom/DOMImplementation.h"
 #include "core/dom/Element.h"
 #include "core/dom/ExecutionContext.h"
-#include "core/dom/RequestAnimationFrameCallback.h"
+#include "core/dom/FrameRequestCallback.h"
 #include "core/editing/Editor.h"
 #include "core/events/DOMWindowEventQueue.h"
 #include "core/events/EventListener.h"
@@ -1368,7 +1368,7 @@ void LocalDOMWindow::resizeTo(int width, int height, bool hasWidth, bool hasHeig
     host->chrome().setWindowRect(adjustWindowRect(*frame(), update));
 }
 
-int LocalDOMWindow::requestAnimationFrame(RequestAnimationFrameCallback* callback)
+int LocalDOMWindow::requestAnimationFrame(FrameRequestCallback* callback)
 {
     callback->m_useLegacyTimeBase = false;
     if (Document* d = document())
@@ -1376,7 +1376,7 @@ int LocalDOMWindow::requestAnimationFrame(RequestAnimationFrameCallback* callbac
     return 0;
 }
 
-int LocalDOMWindow::webkitRequestAnimationFrame(RequestAnimationFrameCallback* callback)
+int LocalDOMWindow::webkitRequestAnimationFrame(FrameRequestCallback* callback)
 {
     callback->m_useLegacyTimeBase = true;
     if (Document* d = document())