Give up focus if the focused view becomes unfocusable

ui/views/controls/webview/webview.cc

 // 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.
 
 #include "ui/views/controls/webview/webview.h"
 
 #include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 40 matching lines @@
   }
   return web_contents();
 }
 
 void WebView::SetWebContents(content::WebContents* replacement) {
   if (replacement == web_contents())
     return;
   DetachWebContents();
   WebContentsObserver::Observe(replacement);
   // web_contents() now returns |replacement| from here onwards.
+  SetFocusable(!!web_contents());
   if (wc_owner_ != replacement)
     wc_owner_.reset();
   if (embed_fullscreen_widget_mode_enabled_) {
     is_embedding_fullscreen_widget_ =
         web_contents() && web_contents()->GetFullscreenRenderWidgetHostView();
   } else {
     DCHECK(!is_embedding_fullscreen_widget_);
   }
   AttachWebContents();
   NotifyMaybeTextInputClientChanged();
@@ skipping 120 matching lines @@
     return FocusManager::IsTabTraversalKeyEvent(event);
 
   // Don't look-up accelerators or tab-traversal if we are showing a non-crashed
   // TabContents.
   // We'll first give the page a chance to process the key events.  If it does
   // not process them, they'll be returned to us and we'll treat them as
   // accelerators then.
   return web_contents() && !web_contents()->IsCrashed();
 }
 
-bool WebView::IsFocusable() const {
-  // We need to be focusable when our contents is not a view hierarchy, as
-  // clicking on the contents needs to focus us.
-  return !!web_contents();
-}
-
 void WebView::OnFocus() {
   if (web_contents())
     web_contents()->Focus();
 }
 
 void WebView::AboutToRequestFocusFromTabTraversal(bool reverse) {
   if (web_contents())
     web_contents()->FocusThroughTabTraversal(reverse);
 }
 
@@ skipping 153 matching lines @@
   if (!contents) {
     content::WebContents::CreateParams create_params(
         browser_context, NULL);
     return content::WebContents::Create(create_params);
   }
 
   return contents;
 }
 
 }  // namespace views