Revert "Move ExtensionCache to //extensions"

chrome/browser/extensions/updater/extension_updater.cc

 // Copyright (c) 2012 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/extensions/updater/extension_updater.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 377 matching lines @@
     will_check_soon_ = true;
   } else {
     NOTREACHED();
   }
 }
 
 bool ExtensionUpdater::WillCheckSoon() const {
   return will_check_soon_;
 }
 
-void ExtensionUpdater::SetExtensionCacheForTesting(
-    ExtensionCache* extension_cache) {
-  extension_cache_ = extension_cache;
-}
-
 void ExtensionUpdater::DoCheckSoon() {
   DCHECK(will_check_soon_);
   CheckNow(default_params_);
   will_check_soon_ = false;
 }
 
 void ExtensionUpdater::AddToDownloader(
     const ExtensionSet* extensions,
     const std::list<std::string>& pending_ids,
     int request_id) {
@@ skipping 349 matching lines @@
   const InProgressCheck& request = requests_in_progress_[request_id];
   if (request.in_progress_ids_.empty()) {
     VLOG(2) << "Finished update check " << request_id;
     if (!request.callback.is_null())
       request.callback.Run();
     requests_in_progress_.erase(request_id);
   }
 }
 
 }  // namespace extensions