Use ScopedTaskEnvironment instead of MessageLoop in storage unit tests.

storage/browser/fileapi/quota/quota_backend_impl_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 "storage/browser/fileapi/quota/quota_backend_impl.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "storage/browser/fileapi/file_system_usage_cache.h"
 #include "storage/browser/fileapi/obfuscated_file_util.h"
 #include "storage/browser/quota/quota_manager_proxy.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/leveldatabase/src/helpers/memenv/memenv.h"
 #include "third_party/leveldatabase/src/include/leveldb/env.h"
 
 using storage::FileSystemUsageCache;
 using storage::ObfuscatedFileUtil;
@@ skipping 114 matching lines @@
 
   base::FilePath GetUsageCachePath(const GURL& origin,
                                    storage::FileSystemType type) {
     base::FilePath path;
     base::File::Error error = backend_->GetUsageCachePath(origin, type, &path);
     EXPECT_EQ(base::File::FILE_OK, error);
     EXPECT_FALSE(path.empty());
     return path;
   }
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   base::ScopedTempDir data_dir_;
   std::unique_ptr<leveldb::Env> in_memory_env_;
   std::unique_ptr<ObfuscatedFileUtil> file_util_;
   FileSystemUsageCache file_system_usage_cache_;
   scoped_refptr<MockQuotaManagerProxy> quota_manager_proxy_;
   std::unique_ptr<QuotaBackendImpl> backend_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuotaBackendImplTest);
 };
@@ skipping 106 matching lines @@
   uint32_t dirty = 0;
   ASSERT_TRUE(file_system_usage_cache_.GetDirty(path, &dirty));
   EXPECT_EQ(1u, dirty);
 
   backend_->DecrementDirtyCount(GURL(kOrigin), type);
   ASSERT_TRUE(file_system_usage_cache_.GetDirty(path, &dirty));
   EXPECT_EQ(0u, dirty);
 }
 
 }  // namespace content