Give up focus if the focused view becomes unfocusable

ui/views/controls/webview/webview.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 UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_
 #define UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/web_contents_delegate.h"
@@ skipping 90 matching lines @@
   // the previously owned WebContents.
   scoped_ptr<content::WebContents> SwapWebContents(
       scoped_ptr<content::WebContents> new_web_contents);
 
   // Overridden from View:
   virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE;
   virtual void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) OVERRIDE;
   virtual bool SkipDefaultKeyEventProcessing(
       const ui::KeyEvent& event) OVERRIDE;
-  virtual bool IsFocusable() const OVERRIDE;
   virtual void OnFocus() OVERRIDE;
   virtual void AboutToRequestFocusFromTabTraversal(bool reverse) OVERRIDE;
   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE;
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() OVERRIDE;
   virtual gfx::Size GetPreferredSize() const OVERRIDE;
 
   // Overridden from content::WebContentsDelegate:
   virtual void WebContentsFocused(content::WebContents* web_contents) OVERRIDE;
   virtual bool EmbedsFullscreenWidget() const OVERRIDE;
 
@@ skipping 38 matching lines @@
   content::BrowserContext* browser_context_;
   bool allow_accelerators_;
   gfx::Size preferred_size_;
 
   DISALLOW_COPY_AND_ASSIGN(WebView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_