Revert "Move ExtensionCache to //extensions"

extensions/shell/browser/shell_extensions_browser_client.cc

Index: extensions/shell/browser/shell_extensions_browser_client.cc
diff --git a/extensions/shell/browser/shell_extensions_browser_client.cc b/extensions/shell/browser/shell_extensions_browser_client.cc
index 68c34483c4b0f4d1d06dc6666cdeb1f79525c557..a4aee60d862cedb4944f6bb6f9856f8aafcaa06a 100644
--- a/extensions/shell/browser/shell_extensions_browser_client.cc
+++ b/extensions/shell/browser/shell_extensions_browser_client.cc
@@ -17,7 +17,6 @@
 #include "extensions/browser/extension_function_registry.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/null_app_sorting.h"
-#include "extensions/browser/updater/null_extension_cache.h"
 #include "extensions/browser/url_request_util.h"
 #include "extensions/shell/browser/shell_extension_host_delegate.h"
 #include "extensions/shell/browser/shell_extension_system_factory.h"
@@ -38,9 +37,7 @@ void RegisterPrefs(user_prefs::PrefRegistrySyncable* registry) {
 
 ShellExtensionsBrowserClient::ShellExtensionsBrowserClient(
     BrowserContext* context)
-    : browser_context_(context),
-      api_client_(new ExtensionsAPIClient),
-      extension_cache_(new NullExtensionCache()) {
+    : browser_context_(context), api_client_(new ExtensionsAPIClient) {
   // Set up the preferences service.
   base::PrefServiceFactory factory;
   factory.set_user_prefs(new TestingPrefStore);
@@ -222,8 +219,4 @@ net::NetLog* ShellExtensionsBrowserClient::GetNetLog() {
   return NULL;
 }
 
-ExtensionCache* ShellExtensionsBrowserClient::GetExtensionCache() {
-  return extension_cache_.get();
-}
-
 }  // namespace extensions