Cleanup: Remove unneeded includes of pref_names.h

chrome/browser/plugin_exceptions_table_model_unittest.cc

 // Copyright (c) 2010 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 "app/table_model_observer.h"
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/mock_plugin_exceptions_table_model.h"
 #include "chrome/common/chrome_switches.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/test/testing_pref_service.h"
 #include "chrome/test/testing_profile.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webkit/plugins/npapi/plugin_group.h"
 #include "webkit/plugins/npapi/webplugininfo.h"
 
 // Can't be an internal namespace because PluginExceptionsTableModel declares
 // as a friend.
 namespace plugin_test_internal {
@@ skipping 186 matching lines @@
   plugin_test_internal::MockTableModelObserver observer(table_model_.get());
   table_model_->SetObserver(&observer);
 
   EXPECT_CALL(observer, OnModelChanged());
   table_model_->RemoveAll();
   EXPECT_EQ(0, table_model_->RowCount());
   EXPECT_EQ(0, static_cast<int>(table_model_->GetGroups().size()));
   CheckInvariants();
   table_model_->SetObserver(NULL);
 }