Remove lots of old blur plumbing.

content/renderer/render_view_impl.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_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 304 matching lines @@
   void DisableAutoResizeForTesting(const gfx::Size& new_size);
 
   // IPC::Listener implementation ----------------------------------------------
 
   bool OnMessageReceived(const IPC::Message& msg) override;
 
   // blink::WebWidgetClient implementation ------------------------------------
 
   // Most methods are handled by RenderWidget.
   void didFocus() override;
-  void didBlur() override;
   void show(blink::WebNavigationPolicy policy) override;
   bool requestPointerLock() override;
   void requestPointerUnlock() override;
   bool isPointerLocked() override;
   void didHandleGestureEvent(const blink::WebGestureEvent& event,
                              bool event_cancelled) override;
   void onMouseDown(const blink::WebNode& mouse_down_node) override;
 
   void initializeLayerTreeView() override;
 
@@ skipping 674 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_