Have AppCache code go through the content embedder API for content settings checks.

chrome/browser/chrome_content_browser_client.h

 // Copyright (c) 2011 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 CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 #pragma once
 
 #include "content/browser/content_browser_client.h"
 
 namespace chrome {
 
 class ChromeContentBrowserClient : public content::ContentBrowserClient {
  public:
   virtual void RenderViewHostCreated(RenderViewHost* render_view_host);
   virtual void PreCreateRenderView(RenderViewHost* render_view_host,
                                    Profile* profile,
                                    const GURL& url);
   virtual void BrowserRenderProcessHostCreated(BrowserRenderProcessHost* host);
   virtual void WorkerProcessHostCreated(WorkerProcessHost* host);
   virtual content::WebUIFactory* GetWebUIFactory();
   virtual GURL GetEffectiveURL(Profile* profile, const GURL& url);
   virtual GURL GetAlternateErrorPageURL(const TabContents* tab);
   virtual std::string GetCanonicalEncodingNameByAliasName(
       const std::string& alias_name);
   virtual void AppendExtraCommandLineSwitches(CommandLine* command_line,
                                               int child_process_id);
   virtual std::string GetApplicationLocale();
+  virtual bool AllowAppCache(const GURL& manifest_url,
+                             const content::ResourceContext* context);
 #if defined(OS_LINUX)
   // Can return an optional fd for crash handling, otherwise returns -1.
   virtual int GetCrashSignalFD(const std::string& process_type);
 #endif
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_