Switch to mojo localstorage backend by default.

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 c8945c24e066cab7ab558f2aff3e340677b5920c..bab7dbe0ce0f81a1e5fc03dafd9eba6b4b42951c 100644
--- a/content/browser/dom_storage/dom_storage_context_wrapper.h
+++ b/content/browser/dom_storage/dom_storage_context_wrapper.h
@@ -77,6 +77,9 @@ class CONTENT_EXPORT DOMStorageContextWrapper :
   void OpenLocalStorage(const url::Origin& origin,
                         mojom::LevelDBWrapperRequest request);
 
+  void SetLocalStorageDatabaseForTesting(
+      leveldb::mojom::LevelDBDatabaseAssociatedPtr database);
+
  private:
   friend class DOMStorageMessageFilter;  // for access to context()
   friend class SessionStorageNamespaceImpl;  // ditto
@@ -95,10 +98,6 @@ class CONTENT_EXPORT DOMStorageContextWrapper :
 
   void PurgeMemory(DOMStorageContextImpl::PurgeOption purge_option);
 
-  void GotMojoLocalStorageUsage(GetLocalStorageUsageCallback callback,
-                                base::SingleThreadTaskRunner* reply_task_runner,
-                                std::vector<LocalStorageUsageInfo> usage);
-
   // Keep all mojo-ish details together and not bleed them through the public
   // interface. The |mojo_state_| object is owned by this object, but destroyed
   // asynchronously on the |mojo_task_runner_|.