Handle WebContents going away in content settings bubbles.

chrome/browser/ui/content_settings/content_setting_bubble_model.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 "chrome/browser/ui/content_settings/content_setting_bubble_model.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 958 matching lines @@
           delegate,
           web_contents,
           profile,
           CONTENT_SETTINGS_TYPE_MIXEDSCRIPT) {
   content_settings::RecordMixedScriptAction(
       content_settings::MIXED_SCRIPT_ACTION_DISPLAYED_BUBBLE);
   set_custom_link_enabled(true);
 }
 
 void ContentSettingMixedScriptBubbleModel::OnCustomLinkClicked() {
-  DCHECK(web_contents());
+  if (!web_contents())
+    return;
+
   web_contents()->SendToAllFrames(
       new ChromeViewMsg_SetAllowRunningInsecureContent(MSG_ROUTING_NONE, true));
   web_contents()->GetMainFrame()->Send(new ChromeViewMsg_ReloadFrame(
       web_contents()->GetMainFrame()->GetRoutingID()));
 
   content_settings::RecordMixedScriptAction(
       content_settings::MIXED_SCRIPT_ACTION_CLICKED_ALLOW);
   content_settings::RecordMixedScriptActionWithRAPPOR(
       content_settings::MIXED_SCRIPT_ACTION_CLICKED_ALLOW,
       web_contents()->GetLastCommittedURL());
@@ skipping 82 matching lines @@
     RegisterProtocolHandler();
   else if (radio_index == RPH_BLOCK)
     UnregisterProtocolHandler();
   else if (radio_index == RPH_IGNORE)
     IgnoreProtocolHandler();
   else
     NOTREACHED();
 }
 
 void ContentSettingRPHBubbleModel::OnDoneClicked() {
+  if (!web_contents())
+    return;
+
   // The user has one chance to deal with the RPH content setting UI,
   // then we remove it.
   TabSpecificContentSettings::FromWebContents(web_contents())->
       ClearPendingProtocolHandler();
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_WEB_CONTENT_SETTINGS_CHANGED,
       content::Source<WebContents>(web_contents()),
       content::NotificationService::NoDetails());
 }
 
 void ContentSettingRPHBubbleModel::RegisterProtocolHandler() {
+  if (!web_contents())
+    return;
+
   // A no-op if the handler hasn't been ignored, but needed in case the user
   // selects sequences like register/ignore/register.
   registry_->RemoveIgnoredHandler(pending_handler_);
 
   registry_->OnAcceptRegisterProtocolHandler(pending_handler_);
   TabSpecificContentSettings::FromWebContents(web_contents())->
       set_pending_protocol_handler_setting(CONTENT_SETTING_ALLOW);
 }
 
 void ContentSettingRPHBubbleModel::UnregisterProtocolHandler() {
+  if (!web_contents())
+    return;
+
   registry_->OnDenyRegisterProtocolHandler(pending_handler_);
   TabSpecificContentSettings::FromWebContents(web_contents())->
       set_pending_protocol_handler_setting(CONTENT_SETTING_BLOCK);
   ClearOrSetPreviousHandler();
 }
 
 void ContentSettingRPHBubbleModel::IgnoreProtocolHandler() {
+  if (!web_contents())
+    return;
+
   registry_->OnIgnoreRegisterProtocolHandler(pending_handler_);
   TabSpecificContentSettings::FromWebContents(web_contents())->
       set_pending_protocol_handler_setting(CONTENT_SETTING_DEFAULT);
   ClearOrSetPreviousHandler();
 }
 
 void ContentSettingRPHBubbleModel::ClearOrSetPreviousHandler() {
   if (previous_handler_.IsEmpty()) {
     registry_->ClearDefault(pending_handler_.protocol());
   } else {
@@ skipping 193 matching lines @@
     ContentSettingBubbleModel::AsSimpleBubbleModel() {
   // In general, bubble models might not inherit from the simple bubble model.
   return nullptr;
 }
 
 ContentSettingMediaStreamBubbleModel*
     ContentSettingBubbleModel::AsMediaStreamBubbleModel() {
   // In general, bubble models might not inherit from the media bubble model.
   return nullptr;
 }