Fix a null AppCacheBackendImpl ptr crash in CompleteCrossSiteTransfer and re…

content/browser/appcache/appcache_request_handler.h

Index: content/browser/appcache/appcache_request_handler.h
diff --git a/content/browser/appcache/appcache_request_handler.h b/content/browser/appcache/appcache_request_handler.h
index d7b55e5a96b7feef7906d077785705d3b13e075d..97196ce992e89f9cc4b4a9fdf47c3900e1606ea3 100644
--- a/content/browser/appcache/appcache_request_handler.h
+++ b/content/browser/appcache/appcache_request_handler.h
@@ -25,6 +25,7 @@ class URLRequestJob;
 
 namespace content {
 class AppCacheRequestHandlerTest;
+class AppCacheService;
 class AppCacheURLRequestJob;
 
 // An instance is created for each net::URLRequest. The instance survives all
@@ -57,6 +58,9 @@ class CONTENT_EXPORT AppCacheRequestHandler
   void PrepareForCrossSiteTransfer(int old_process_id);
   void CompleteCrossSiteTransfer(int new_process_id, int new_host_id);
   void MaybeCompleteCrossSiteTransferInOldProcess(int old_process_id);
+  bool SanityCheckIsSameService(AppCacheService* service) {

[jsbell, 2016/01/14 22:52:29]

Add brief documentation here, i.e. why anyone would call this?

+    return !host_ || (host_->service() == service);
+  }
 
   static bool IsMainResourceType(ResourceType type) {
     return IsResourceTypeFrame(type) ||