Move Frame to the Oilpan heap.

Source/web/WebFrame.cpp

 // Copyright 2014 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.
 
 #include "config.h"
 #include "public/web/WebFrame.h"
 
 #include "core/frame/RemoteFrame.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "platform/UserGestureIndicator.h"
@@ skipping 10 matching lines @@
         return 0;
 
     return frame->isWebLocalFrame()
         ? static_cast<Frame*>(toWebLocalFrameImpl(frame)->frame())
         : toWebRemoteFrameImpl(frame)->frame();
 }
 
 bool WebFrame::swap(WebFrame* frame)
 {
     using std::swap;
-    RefPtr<Frame> oldFrame = toCoreFrame(this);
+    RefPtrWillBeRawPtr<Frame> oldFrame = toCoreFrame(this);
 
     // All child frames must be detached first.
     oldFrame->detachChildren();
 
     // If the frame has been detached during detaching its children, return
     // immediately.
     // FIXME: There is no unit test for this condition, so one needs to be
     // written.
     if (!oldFrame->host())
         return false;
@@ skipping 181 matching lines @@
     , m_opener(0)
     , m_openedFrameTracker(new OpenedFrameTracker)
 {
 }
 
 WebFrame::~WebFrame()
 {
     m_openedFrameTracker.reset(0);
 }
 
+void WebFrame::traceChildren(Visitor* visitor, WebFrame* frame)
+{
+#if ENABLE(OILPAN)
+    // Trace the children frames.
+    WebFrame* child = frame ? frame->firstChild() : 0;
+    while (child) {
+        if (child->isWebLocalFrame())
+            visitor->trace(toWebLocalFrameImpl(child));
+        else
+            visitor->trace(toWebRemoteFrameImpl(child));
+
+        child = child->nextSibling();
+    }
+#endif
+}
+
 } // namespace blink