Code: AppCacheDispatcherHost::AppCacheDispatcherHost(
    ChromeAppCacheService* appcache_service,
    int process_id)
     : BrowserMessageFilter(AppCacheMsgStart),
       appcache_service_(appcache_service),
       frontend_proxy_(this),
      process_id_(process_id) {
 }

Vulnerability Type: DoS 
CWE ID: 
Summary: Use-after-free vulnerability in content/browser/appcache/appcache_dispatcher_host.cc in the AppCache implementation in Google Chrome before 47.0.2526.73 allows remote attackers to cause a denial of service or possibly have unspecified other impact by leveraging incorrect pointer maintenance associated with certain callbacks.
Commit Message: AppCache: Use WeakPtr<> to fix a potential uaf bug.

BUG=554908

Review URL: https://codereview.chromium.org/1441683004

Cr-Commit-Position: refs/heads/master@{#359930}