[WebsiteSettings] Set view to null on manager to ensure no stale access.

chrome/browser/ui/website_settings/permission_bubble_manager.cc

 // Copyright 2014 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/website_settings/permission_bubble_manager.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/ui/website_settings/permission_bubble_request.h"
 #include "chrome/common/chrome_switches.h"
 
@@ skipping 72 matching lines @@
   : content::WebContentsObserver(web_contents),
     bubble_showing_(false),
     view_(NULL),
     customization_mode_(false) {
   timer_.reset(new base::Timer(FROM_HERE,
       base::TimeDelta::FromMilliseconds(kPermissionsCoalesceIntervalMs),
       base::Bind(&PermissionBubbleManager::ShowBubble, base::Unretained(this)),
       false));
 }
 
-PermissionBubbleManager::~PermissionBubbleManager() {}
+PermissionBubbleManager::~PermissionBubbleManager() {
+  if (view_ != NULL) {
+    view_->SetDelegate(NULL);
+    view_->Hide();
+    bubble_showing_ = false;
+  }
+}
 
 void PermissionBubbleManager::DidFinishLoad(
     int64 frame_id,
     const GURL& validated_url,
     bool is_main_frame,
     content::RenderViewHost* render_view_host) {
   // Allows extra time for additional requests to coalesce.
   if (timer_->IsRunning())
     timer_->Reset();
 }
@@ skipping 88 matching lines @@
     timer_->Reset();
   }
 }
 
 void PermissionBubbleManager::SetCoalesceIntervalForTesting(int interval_ms) {
   timer_.reset(new base::Timer(FROM_HERE,
       base::TimeDelta::FromMilliseconds(interval_ms),
       base::Bind(&PermissionBubbleManager::ShowBubble, base::Unretained(this)),
       false));
 }