text input focus: RemoveObserver when RenderProcessHost exits.

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_process_host.h"
@@ skipping 253 matching lines @@
 // WebView, content::RenderProcessHostObserver implementation:
 
 void WebView::RenderProcessExited(content::RenderProcessHost* host,
                                   base::TerminationStatus status,
                                   int exit_code) {
   NotifyMaybeTextInputClientChanged();
 }
 
 void WebView::RenderProcessHostDestroyed(content::RenderProcessHost* host) {
   DCHECK_EQ(host, observing_render_process_host_);
+  observing_render_process_host_->RemoveObserver(this);
   observing_render_process_host_ = nullptr;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebView, content::WebContentsDelegate implementation:
 
 void WebView::WebContentsFocused(content::WebContents* web_contents) {
   DCHECK(wc_owner_.get());
   // The WebView is only the delegate of WebContentses it creates itself.
   OnWebContentsFocused(wc_owner_.get());
@@ skipping 134 matching lines @@
   if (!contents) {
     content::WebContents::CreateParams create_params(
         browser_context, NULL);
     return content::WebContents::Create(create_params);
   }
 
   return contents;
 }
 
 }  // namespace views