Revert "Move ExtensionCache to //extensions"

extensions/browser/test_extensions_browser_client.cc

 // Copyright 2014 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 "extensions/browser/test_extensions_browser_client.h"
 
 #include "content/public/browser/browser_context.h"
 #include "extensions/browser/app_sorting.h"
 #include "extensions/browser/extension_host_delegate.h"
 #include "extensions/browser/test_runtime_api_delegate.h"
-#include "extensions/browser/updater/null_extension_cache.h"
 
 using content::BrowserContext;
 
 namespace extensions {
 
 TestExtensionsBrowserClient::TestExtensionsBrowserClient(
     BrowserContext* main_context)
     : main_context_(main_context),
       incognito_context_(NULL),
       process_manager_delegate_(NULL),
-      extension_system_factory_(NULL),
-      extension_cache_(new NullExtensionCache) {
+      extension_system_factory_(NULL) {
   DCHECK(main_context_);
   DCHECK(!main_context_->IsOffTheRecord());
 }
 
 TestExtensionsBrowserClient::~TestExtensionsBrowserClient() {}
 
 void TestExtensionsBrowserClient::SetIncognitoContext(BrowserContext* context) {
   // If a context is provided it must be off-the-record.
   DCHECK(!context || context->IsOffTheRecord());
   incognito_context_ = context;
@@ skipping 132 matching lines @@
 
 void TestExtensionsBrowserClient::BroadcastEventToRenderers(
     const std::string& event_name,
     scoped_ptr<base::ListValue> args) {
 }
 
 net::NetLog* TestExtensionsBrowserClient::GetNetLog() {
   return NULL;
 }
 
-ExtensionCache* TestExtensionsBrowserClient::GetExtensionCache() {
-  return extension_cache_.get();
-}
-
 }  // namespace extensions