Revert of Add ExtensionsApiClient interface, use it in the storage API SettingsFrontend

apps/shell/browser/shell_extensions_browser_client.h

Index: apps/shell/browser/shell_extensions_browser_client.h
diff --git a/apps/shell/browser/shell_extensions_browser_client.h b/apps/shell/browser/shell_extensions_browser_client.h
index b8c1a5a1fab99b8be523d487e3de7641ca974407..d90039456516d4c25f77c76e4559ba4007ed59ca 100644
--- a/apps/shell/browser/shell_extensions_browser_client.h
+++ b/apps/shell/browser/shell_extensions_browser_client.h
@@ -11,8 +11,6 @@
 class PrefService;
 
 namespace extensions {
-
-class ExtensionsAPIClient;
 
 // An ExtensionsBrowserClient that supports a single content::BrowserContent
 // with no related incognito context.
@@ -65,9 +63,6 @@
   // The single BrowserContext for app_shell. Not owned.
   content::BrowserContext* browser_context_;
 
-  // Support for extension APIs.
-  scoped_ptr<ExtensionsAPIClient> api_client_;
-
   // The PrefService for |browser_context_|.
   scoped_ptr<PrefService> prefs_;