OOPIF: Check whether localFrameRootTemporary is valid when processing resizing messages

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 1694 matching lines @@
 }
 
 void WebViewImpl::setTopControlsLayoutHeight(float height)
 {
     m_topControlsLayoutHeight = height;
     didUpdateTopControls();
 }
 
 void WebViewImpl::didUpdateTopControls()
 {
-    FrameView* view = localFrameRootTemporary()->frameView();
+    WebLocalFrameImpl* localFrameRoot = localFrameRootTemporary();
+    if (!localFrameRoot)
+        return;
+
+    FrameView* view = localFrameRoot->frameView();
     if (!view)
         return;
 
     // The viewport bounds were adjusted on the compositor by this much due to top controls. Tell
     // the FrameView about it so it can make correct scroll offset clamping decisions during compositor
     // commits.
     float topControlsViewportAdjustment = m_topControlsContentOffset - m_topControlsLayoutHeight;
     view->setTopControlsViewportAdjustment(topControlsViewportAdjustment);
 }
 
 void WebViewImpl::resize(const WebSize& newSize)
 {
     if (m_shouldAutoResize || m_size == newSize)
         return;
 
-    FrameView* view = localFrameRootTemporary()->frameView();
+    WebLocalFrameImpl* localFrameRoot = localFrameRootTemporary();
+    if (!localFrameRoot)
+        return;
+
+    FrameView* view = localFrameRoot->frameView();
     if (!view)
         return;
 
     bool shouldAnchorAndRescaleViewport = settings()->mainFrameResizesAreOrientationChanges()
         && m_size.width && contentsSize().width() && newSize.width != m_size.width && !m_fullscreenController->isFullscreen();
     float oldPageScaleFactor = pageScaleFactor();
     float oldMinimumPageScaleFactor = minimumPageScaleFactor();
 
     m_size = newSize;
 
@@ skipping 2701 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 blink