Integrate mojo localstorage implementation with DOMStorageContext API.

content/browser/dom_storage/dom_storage_context_wrapper.h

Index: content/browser/dom_storage/dom_storage_context_wrapper.h
diff --git a/content/browser/dom_storage/dom_storage_context_wrapper.h b/content/browser/dom_storage/dom_storage_context_wrapper.h
index 2a05e8004ca33c041b3513bedc87b7d490b6d51d..14efb4515db55acc6a356ed4c6d6ad254c947599 100644
--- a/content/browser/dom_storage/dom_storage_context_wrapper.h
+++ b/content/browser/dom_storage/dom_storage_context_wrapper.h
@@ -94,6 +94,9 @@ class CONTENT_EXPORT DOMStorageContextWrapper :
 
   void PurgeMemory(DOMStorageContextImpl::PurgeOption purge_option);
 
+  void GotMojoLocalStorageUsage(GetLocalStorageUsageCallback callback,
+                                std::vector<LocalStorageUsageInfo> usage);
+
   // Keep all mojo-ish details together and not bleed them through the public
   // interface.
   std::unique_ptr<LocalStorageContextMojo> mojo_state_;