Remove lots of old blur plumbing.

content/browser/renderer_host/render_view_host_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_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 328 matching lines @@
   // RenderWidgetHost protected overrides.
   void OnUserGesture() override;
   void NotifyRendererUnresponsive() override;
   void NotifyRendererResponsive() override;
   void OnRenderAutoResized(const gfx::Size& size) override;
   void RequestToLockMouse(bool user_gesture,
                           bool last_unlocked_by_target) override;
   bool IsFullscreenGranted() const override;
   blink::WebDisplayMode GetDisplayMode() const override;
   void OnFocus() override;
-  void OnBlur() override;
 
   // IPC message handlers.
   void OnShowView(int route_id,
                   WindowOpenDisposition disposition,
                   const gfx::Rect& initial_rect,
                   bool user_gesture);
   void OnShowWidget(int route_id, const gfx::Rect& initial_rect);
   void OnShowFullscreenWidget(int route_id);
   void OnRenderProcessGone(int status, int error_code);
   void OnUpdateState(int32 page_id, const PageState& state);
@@ skipping 132 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_