Move didFocus from WebWidgetClient to WebViewClient.

content/renderer/render_widget.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_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 218 matching lines @@
   void SetScreenMetricsEmulationParameters(
       bool enabled,
       const blink::WebDeviceEmulationParams& params) override;
   void SetScreenRects(const gfx::Rect& view_screen_rect,
                       const gfx::Rect& window_screen_rect) override;
 
   // blink::WebWidgetClient
   void initializeLayerTreeView() override;
   blink::WebLayerTreeView* layerTreeView() override;
   void didMeaningfulLayout(blink::WebMeaningfulLayout layout_type) override;
-  void didFocus() override;
   void didChangeCursor(const blink::WebCursorInfo&) override;
   void closeWidgetSoon() override;
   void show(blink::WebNavigationPolicy) override;
   blink::WebRect windowRect() override;
   void setToolTipText(const blink::WebString& text,
                       blink::WebTextDirection hint) override;
   void setWindowRect(const blink::WebRect&) override;
   blink::WebRect windowResizerRect() override;
   blink::WebScreenInfo screenInfo() override;
   void resetInputMethod() override;
@@ skipping 532 matching lines @@
   // This reference is set by the RenderFrame and is used to query the IME-
   // related state from the plugin to later send to the browser.
   PepperPluginInstanceImpl* focused_pepper_plugin_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_