Cleanup: Remove more unneeded browser_thread.h includes.

chrome/browser/policy/device_policy_cache_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 "chrome/browser/policy/device_policy_cache.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/cros/cryptohome_library.h"
 #include "chrome/browser/chromeos/settings/device_settings_test_helper.h"
 #include "chrome/browser/policy/cloud_policy_data_store.h"
 #include "chrome/browser/policy/enterprise_install_attributes.h"
 #include "chrome/browser/policy/proto/chrome_device_policy.pb.h"
 #include "chrome/browser/policy/proto/device_management_backend.pb.h"
-#include "content/public/test/test_browser_thread.h"
 #include "policy/policy_constants.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::Mock;
 
 namespace em = enterprise_management;
 
 namespace policy {
 
@@ skipping 198 matching lines @@
   device_settings_test_helper_.set_policy_blob(device_policy_.GetBlob());
   Startup();
 
   StringValue expected_config(fake_config);
   EXPECT_TRUE(
       Value::Equals(&expected_config,
                     GetPolicy(key::kDeviceOpenNetworkConfiguration)));
 }
 
 }  // namespace policy