Use ScopedTaskEnvironment instead of MessageLoop in content unit tests.

content/browser/appcache/mock_appcache_storage_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 <stddef.h>
 #include <stdint.h>
 
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "content/browser/appcache/appcache.h"
 #include "content/browser/appcache/appcache_group.h"
 #include "content/browser/appcache/appcache_response.h"
 #include "content/browser/appcache/appcache_storage.h"
 #include "content/browser/appcache/mock_appcache_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
 class MockAppCacheStorageTest : public testing::Test {
@@ skipping 56 matching lines @@
     bool obsoleted_success_;
     GURL found_url_;
     AppCacheEntry found_entry_;
     GURL found_fallback_url_;
     AppCacheEntry found_fallback_entry_;
     int64_t found_cache_id_;
     GURL found_manifest_url_;
   };
 
  private:
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
 };
 
 TEST_F(MockAppCacheStorageTest, LoadCache_Miss) {
   // Attempt to load a cache that doesn't exist. Should
   // complete asyncly.
   MockAppCacheService service;
   MockStorageDelegate delegate;
   service.storage()->LoadCache(111, &delegate);
   EXPECT_NE(111, delegate.loaded_cache_id_);
   base::RunLoop().RunUntilIdle();  // Do async task execution.
@@ skipping 533 matching lines @@
   EXPECT_EQ(kAppCacheNoCacheId, delegate.found_cache_id_);
   EXPECT_EQ(kAppCacheNoResponseId, delegate.found_entry_.response_id());
   EXPECT_EQ(kAppCacheNoResponseId,
             delegate.found_fallback_entry_.response_id());
   EXPECT_TRUE(delegate.found_fallback_url_.is_empty());
   EXPECT_EQ(0, delegate.found_entry_.types());
   EXPECT_EQ(0, delegate.found_fallback_entry_.types());
 }
 
 }  // namespace content