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

chrome/browser/profiles/off_the_record_profile_io_data.cc

Index: chrome/browser/profiles/off_the_record_profile_io_data.cc
===================================================================
--- chrome/browser/profiles/off_the_record_profile_io_data.cc	(revision 84527)
+++ chrome/browser/profiles/off_the_record_profile_io_data.cc	(working copy)
@@ -49,7 +49,9 @@
 const content::ResourceContext&
 OffTheRecordProfileIOData::Handle::GetResourceContext() const {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  LazyInitialize();
+  // Don't call LazyInitialize here, since the resource context is created at
+  // the beginning of initalization and is used by some members while they're
+  // being initialized (i.e. AppCacheService).
   return io_data_->GetResourceContext();
 }