Remove calls to deprecated MessageLoop methods in extensions.

extensions/browser/api/storage/storage_frontend_unittest.cc

 // 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.
 
 #include "extensions/browser/api/storage/storage_frontend.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 38 matching lines @@
   void SetUp() override {
     ExtensionsTest::SetUp();
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     storage_factory_ = new ValueStoreFactoryImpl(temp_dir_.path());
     ResetFrontend();
   }
 
   void TearDown() override {
     frontend_.reset();
     // Execute any pending deletion tasks.
-    message_loop_.RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
     ExtensionsTest::TearDown();
   }
 
  protected:
   void ResetFrontend() {
     frontend_ =
         StorageFrontend::CreateForTesting(storage_factory_, browser_context());
   }
 
   base::ScopedTempDir temp_dir_;
@@ skipping 145 matching lines @@
   std::unique_ptr<base::Value> megabyte = util::CreateMegabyte();
   for (int i = 0; i < 5; ++i) {
     local_storage->Set(DEFAULTS, base::IntToString(i), *megabyte);
   }
 
   EXPECT_FALSE(
       local_storage->Set(DEFAULTS, "WillError", *megabyte)->status().ok());
 }
 
 }  // namespace extensions