Use ScopedTaskEnvironment instead of MessageLoop in tests that use v8.

extensions/renderer/api_binding_test.h

 // Copyright 2016 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.
 
 #ifndef EXTENSIONS_RENDERER_API_BINDING_TEST_H_
 #define EXTENSIONS_RENDERER_API_BINDING_TEST_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "v8/include/v8.h"
 
 namespace gin {
 class ContextHolder;
 class IsolateHolder;
 }
 
 namespace extensions {
 
@@ skipping 28 matching lines @@
   // Allows subclasses to perform context disposal cleanup.
   virtual void OnWillDisposeContext(v8::Local<v8::Context> context) {}
 
   // Returns the associated isolate. Defined out-of-line to avoid the include
   // for IsolateHolder in the header.
   v8::Isolate* isolate();
 
  private:
   void RunGarbageCollection();
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
+
   std::unique_ptr<gin::IsolateHolder> isolate_holder_;
   std::unique_ptr<gin::ContextHolder> main_context_holder_;
   std::vector<std::unique_ptr<gin::ContextHolder>> additional_context_holders_;
 
   DISALLOW_COPY_AND_ASSIGN(APIBindingTest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_API_BINDING_TEST_H_