Relanding http://codereview.chromium.org/2870050/show.

chrome/browser/renderer_host/render_view_host_delegate.h

 // Copyright (c) 2010 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 CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 656 matching lines @@
 
   // Notification from the renderer host that blocked UI event occurred.
   // This happens when there are tab-modal dialogs. In this case, the
   // notification is needed to let us draw attention to the dialog (i.e.
   // refocus on the modal dialog, flash title etc).
   virtual void OnIgnoredUIEvent() {}
 
   // Notification from the renderer that JS runs out of memory.
   virtual void OnJSOutOfMemory() {}
 
-  // Returns true if this this object can be blurred through a javascript
-  // obj.blur() call. ConstrainedWindows shouldn't be able to be blurred, but
-  // generally most other windows will be.
-  virtual bool CanBlur() const;
-
   // Return the rect where to display the resize corner, if any, otherwise
   // an empty rect.
   virtual gfx::Rect GetRootWindowResizerRect() const;
 
   // Notification that the renderer has become unresponsive. The
   // delegate can use this notification to show a warning to the user.
   virtual void RendererUnresponsive(RenderViewHost* render_view_host,
                                     bool is_during_unload) {}
 
   // Notification that a previously unresponsive renderer has become
   // responsive again. The delegate can use this notification to end the
   // warning shown to the user.
   virtual void RendererResponsive(RenderViewHost* render_view_host) {}
 
   // Notification that the RenderViewHost's load state changed.
   virtual void LoadStateChanged(const GURL& url, net::LoadState load_state,
                                 uint64 upload_position, uint64 upload_size) {}
 
   // Returns true if this view is used to host an external tab container.
   virtual bool IsExternalTabContainer() const;
 
   // The RenderView has inserted one css file into page.
   virtual void DidInsertCSS() {}
 
   // A different node in the page got focused.
   virtual void FocusedNodeChanged() {}
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_