Remove RenderViewObserver::ZoomLevelChanged.

content/public/renderer/render_view_observer.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_
 #define CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "content/common/content_export.h"
@@ skipping 61 matching lines @@
       const blink::WebVector<blink::WebString>& newly_matching_selectors,
       const blink::WebVector<blink::WebString>& stopped_matching_selectors) {}
   virtual void WillSendSubmitEvent(blink::WebLocalFrame* frame,
                                    const blink::WebFormElement& form) {}
   virtual void WillSubmitForm(blink::WebLocalFrame* frame,
                               const blink::WebFormElement& form) {}
   virtual void DidCreateDataSource(blink::WebLocalFrame* frame,
                                    blink::WebDataSource* ds) {}
   virtual void PrintPage(blink::WebLocalFrame* frame, bool user_initiated) {}
   virtual void FocusedNodeChanged(const blink::WebNode& node) {}
-  virtual void ZoomLevelChanged() {};
   virtual void DidChangeScrollOffset(blink::WebLocalFrame* frame) {}
   virtual void DraggableRegionsChanged(blink::WebFrame* frame) {}
   virtual void DidCommitCompositorFrame() {}
   virtual void DidUpdateLayout() {}
 
   // These match the RenderView methods.
   virtual void DidHandleMouseEvent(const blink::WebMouseEvent& event) {}
   virtual void DidHandleTouchEvent(const blink::WebTouchEvent& event) {}
 
   // These match incoming IPCs.
@@ skipping 32 matching lines @@
   RenderView* render_view_;
   // The routing ID of the associated RenderView.
   int routing_id_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_