Move allowsBrokenNullLayerTreeView calls from WebViewClient to WebWidgetClient.

third_party/WebKit/public/web/WebViewClient.h

 /*
  * Copyright (C) 2009 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 232 matching lines @@
 
 
     // Draggable regions ----------------------------------------------------
 
     // Informs the browser that the draggable regions have been updated.
     virtual void draggableRegionsChanged() { }
 
     // TODO(lfg): These methods are only exposed through WebViewClient while we
     // refactor WebView to not inherit from WebWidget.
     // WebWidgetClient overrides.
-    bool allowsBrokenNullLayerTreeView() const override { return false; }
     void closeWidgetSoon() override {}
     void convertViewportToWindow(WebRect* rect) override {}
     void convertWindowToViewport(WebFloatRect* rect) override {}
     void didAutoResize(const WebSize& newSize) override {}
     void didChangeCursor(const WebCursorInfo&) override {}
     void didFocus() override {}
     void didHandleGestureEvent(const WebGestureEvent& event, bool eventCancelled) override {}
     void didInvalidateRect(const WebRect&) override {}
     void didMeaningfulLayout(WebMeaningfulLayout) override {}
     void didOverscroll(const WebFloatSize& overscrollDelta, const WebFloatSize& accumulatedOverscroll, const WebFloatPoint& positionInViewport, const WebFloatSize& velocityInViewport) override {}
     void didUpdateTextOfFocusedElementByNonUserInput() override {}
     void hasTouchEventHandlers(bool) override {}
     void initializeLayerTreeView() override {}
     WebLayerTreeView* layerTreeView() override { return 0; }
     void onMouseDown(const WebNode& mouseDownNode) override {}
     void resetInputMethod() override {}
     WebRect rootWindowRect() override { return WebRect(); }
     void scheduleAnimation() override {}
     WebScreenInfo screenInfo() override { return WebScreenInfo(); }
     void setToolTipText(const WebString&, WebTextDirection hint) override {}
     void setTouchAction(WebTouchAction touchAction) override {}
     void setWindowRect(const WebRect&) override {}
     void showImeIfNeeded() override {}
     void showUnhandledTapUIIfNeeded(const WebPoint& tappedPosition, const WebNode& tappedNode, bool pageChanged) override {}
     void show(WebNavigationPolicy) override {}
     WebRect windowRect() override { return WebRect(); }
     WebRect windowResizerRect() override { return WebRect(); }
+    virtual WebWidgetClient* widgetClient() { return this; }
 
 protected:
     ~WebViewClient() { }
 };
 
 } // namespace blink
 
 #endif