Have Frame::tree() return a reference

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1525 matching lines @@
                                   ScrollGranularity scrollGranularity)
 {
     Frame* frame = focusedWebCoreFrame();
     if (!frame)
         return false;
 
     bool scrollHandled = frame->eventHandler()->scrollOverflow(scrollDirection, scrollGranularity);
     Frame* currentFrame = frame;
     while (!scrollHandled && currentFrame) {
         scrollHandled = currentFrame->view()->scroll(scrollDirection, scrollGranularity);
-        currentFrame = currentFrame->tree()->parent();
+        currentFrame = currentFrame->tree().parent();
     }
     return scrollHandled;
 }
 
 void  WebViewImpl::popupOpened(WebCore::PopupContainer* popupContainer)
 {
     if (popupContainer->popupType() == WebCore::PopupContainer::Select) {
         ASSERT(!m_selectPopup);
         m_selectPopup = popupContainer;
         Document* document = mainFrameImpl()->frame()->document();
@@ skipping 1014 matching lines @@
 {
     return mainFrameImpl();
 }
 
 WebFrame* WebViewImpl::findFrameByName(
     const WebString& name, WebFrame* relativeToFrame)
 {
     if (!relativeToFrame)
         relativeToFrame = mainFrame();
     Frame* frame = toWebFrameImpl(relativeToFrame)->frame();
-    frame = frame->tree()->find(name);
+    frame = frame->tree().find(name);
     return WebFrameImpl::fromFrame(frame);
 }
 
 WebFrame* WebViewImpl::focusedFrame()
 {
     return WebFrameImpl::fromFrame(focusedWebCoreFrame());
 }
 
 void WebViewImpl::setFocusedFrame(WebFrame* frame)
 {
@@ skipping 696 matching lines @@
 
     m_page->dragController().performDrag(&dragData);
 
     m_dragOperation = WebDragOperationNone;
     m_currentDragData = 0;
 }
 
 void WebViewImpl::spellingMarkers(WebVector<uint32_t>* markers)
 {
     Vector<uint32_t> result;
-    for (Frame* frame = m_page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
+    for (Frame* frame = m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
         const Vector<DocumentMarker*>& documentMarkers = frame->document()->markers()->markers();
         for (size_t i = 0; i < documentMarkers.size(); ++i)
             result.append(documentMarkers[i]->hash());
     }
     markers->assign(result);
 }
 
 WebDragOperation WebViewImpl::dragTargetDragEnterOrOver(const WebPoint& clientPoint, const WebPoint& screenPoint, DragAction dragAction, int keyModifiers)
 {
     ASSERT(m_currentDragData);
@@ skipping 218 matching lines @@
 }
 
 // WebView --------------------------------------------------------------------
 
 void WebViewImpl::setIsTransparent(bool isTransparent)
 {
     // Set any existing frames to be transparent.
     Frame* frame = m_page->mainFrame();
     while (frame) {
         frame->view()->setTransparent(isTransparent);
-        frame = frame->tree()->traverseNext();
+        frame = frame->tree().traverseNext();
     }
 
     // Future frames check this to know whether to be transparent.
     m_isTransparent = isTransparent;
 }
 
 bool WebViewImpl::isTransparent() const
 {
     return m_isTransparent;
 }
@@ skipping 586 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace WebKit