Remove calls to MessageLoop::current() in base.

ios/chrome/browser/net/retryable_url_fetcher_unittest.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/net/retryable_url_fetcher.h"
 
 #import "base/mac/scoped_nsobject.h"
+#include "base/message_loop/message_loop.h"
 #include "ios/web/public/test/test_web_thread.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_test_util.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
 namespace {
 // An arbitrary text string for a fake response.
 NSString* const kFakeResponseString = @"Something interesting here.";
@@ skipping 76 matching lines @@
   DCHECK(fetcher);
   DCHECK(fetcher->delegate());
   [test_delegate_ setResponsesProcessed:0U];
   fetcher->set_response_code(404);
   fetcher->SetResponseString("");
   fetcher->delegate()->OnURLFetchComplete(fetcher);
   EXPECT_EQ(0U, [test_delegate_ responsesProcessed]);
 }
 
 }  // namespace