Cleanup: Remove unneeded chrome/common/pref_names.h includes.

chrome/browser/chromeos/accessibility/magnification_manager_unittest.cc

 // Copyright (c) 2013 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/chromeos/accessibility/magnification_manager.h"
 
 #include "ash/magnifier/magnifier_constants.h"
 #include "ash/test/ash_test_base.h"
 #include "base/prefs/pref_service.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromeos {
 namespace {
 
 void EnableMagnifier() {
   return MagnificationManager::Get()->SetMagnifierEnabled(true);
 }
 
@@ skipping 47 matching lines @@
   EXPECT_TRUE(IsMagnifierEnabled());
   EXPECT_EQ(GetMagnifierType(), ash::MAGNIFIER_FULL);
 
   // Disables magnifier, and confirm the status is set successfully.
   DisableMagnifier();
   EXPECT_FALSE(IsMagnifierEnabled());
   EXPECT_EQ(GetMagnifierType(), ash::MAGNIFIER_FULL);
 }
 
 }  // namespace chromeos