Moved JsonPrefStore to use SequencedWorkerPool

chrome/service/service_process_prefs_unittest.cc

 // Copyright (c) 2012 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 <string>
 
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
 #include "base/scoped_temp_dir.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "chrome/service/service_process_prefs.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class ServiceProcessPrefsTest : public testing::Test {
  protected:
-  virtual void SetUp() {
-    message_loop_proxy_ = base::MessageLoopProxy::current();
+  virtual void SetUp() OVERRIDE {
+    blocking_pool_ = new base::SequencedWorkerPool(1, "TestBlocking");
 
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
 
     prefs_.reset(new ServiceProcessPrefs(
         temp_dir_.path().AppendASCII("service_process_prefs.txt"),
-        message_loop_proxy_.get()));
+        blocking_pool_.get()));
+  }
+
+  virtual void TearDown() OVERRIDE {
+    prefs_.reset(NULL);
+    blocking_pool_->Shutdown();
   }
 
   // The path to temporary directory used to contain the test operations.
   ScopedTempDir temp_dir_;
-  // A message loop that we can use as the file thread message loop.
+  // A message loop that we need for timers.
   MessageLoop message_loop_;
-  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
+  // A blocking pool that we can use for file operations.
+  scoped_refptr<base::SequencedWorkerPool> blocking_pool_;
   scoped_ptr<ServiceProcessPrefs> prefs_;
 };
 
 // Test ability to retrieve prefs
 TEST_F(ServiceProcessPrefsTest, RetrievePrefs) {
   prefs_->SetBoolean("testb", true);
   prefs_->SetString("tests", "testvalue");
   prefs_->WritePrefs();
-  MessageLoop::current()->RunAllPending();
+  blocking_pool_->FlushForTesting();
   prefs_->SetBoolean("testb", false);   // overwrite
   prefs_->SetString("tests", "");   // overwrite
   prefs_->ReadPrefs();
   EXPECT_EQ(prefs_->GetBoolean("testb", false), true);
   EXPECT_EQ(prefs_->GetString("tests", ""), "testvalue");
 }