Cleanup: Remove unneeded includes of pref_names.h

chrome/browser/gtk/bookmark_editor_gtk_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 <gtk/gtk.h>
 
+#include <string>
+
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/gtk/bookmark_editor_gtk.h"
 #include "chrome/browser/gtk/bookmark_tree_model.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/test/testing_profile.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::Time;
 using base::TimeDelta;
 using bookmark_utils::GetTitleFromTreeIter;
 
 // Base class for bookmark editor tests. This class is a copy from
 // bookmark_editor_view_unittest.cc, and all the tests in this file are
 // GTK-ifications of the corresponding views tests. Testing here is really
@@ skipping 292 matching lines @@
   gtk_entry_set_text(GTK_ENTRY(editor.name_entry_), "new_a");
 
   editor.ApplyEdits();
 
   const BookmarkNode* other_node = profile_->GetBookmarkModel()->other_node();
   ASSERT_EQ(2, other_node->GetChildCount());
 
   const BookmarkNode* new_node = other_node->GetChild(0);
   EXPECT_EQ(ASCIIToUTF16("new_a"), new_node->GetTitle());
 }