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

chrome/browser/renderer_host/render_view_host_delegate.h

Index: chrome/browser/renderer_host/render_view_host_delegate.h
diff --git a/chrome/browser/renderer_host/render_view_host_delegate.h b/chrome/browser/renderer_host/render_view_host_delegate.h
index 9050cbd217d6fe86fd1b39e0363be147b34924e1..d61e4080414974ca2a42b7931971300387ad74b4 100644
--- a/chrome/browser/renderer_host/render_view_host_delegate.h
+++ b/chrome/browser/renderer_host/render_view_host_delegate.h
@@ -674,11 +674,6 @@ class RenderViewHostDelegate {
   // 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;