Use base::MessageLoop in more files.

sync/test/accounts_client/test_accounts_client.cc

Index: sync/test/accounts_client/test_accounts_client.cc
diff --git a/sync/test/accounts_client/test_accounts_client.cc b/sync/test/accounts_client/test_accounts_client.cc
index 82e7af2c8fde8ef79cf92126d7ec01bf7e31679f..8257691cdaeea6d6c9db38a38a76d86176370ba4 100644
--- a/sync/test/accounts_client/test_accounts_client.cc
+++ b/sync/test/accounts_client/test_accounts_client.cc
@@ -135,7 +135,7 @@ GURL TestAccountsClient::CreateGURLWithPath(const string& path) {
 
 
 bool TestAccountsClient::SendRequest(const GURL& url, string* response) {
-  MessageLoop* loop = MessageLoop::current();
+  base::MessageLoop* loop = base::MessageLoop::current();
   scoped_refptr<URLRequestContextGetter> context_getter(
       new URLRequestContextGetter(loop->message_loop_proxy()));
 
@@ -148,7 +148,7 @@ bool TestAccountsClient::SendRequest(const GURL& url, string* response) {
   fetcher->SetUploadData("application/json", "");
   fetcher->Start();
 
-  MessageLoop::current()->PostDelayedTask(FROM_HERE,
+  base::MessageLoop::current()->PostDelayedTask(FROM_HERE,
     run_loop.QuitClosure(),
     kRequestTimeout);
   run_loop.Run();