Try to cut down Browser/TabContents header dependencies.

chrome/browser/omnibox_search_hint.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 "chrome/browser/omnibox_search_hint.h"
 
 #include "app/animation.h"
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/command_line.h"
 #include "base/task.h"
+#include "chrome/browser/autocomplete/autocomplete_edit.h"
 #include "chrome/browser/autocomplete/autocomplete_edit_view.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_window.h"
 #include "chrome/browser/location_bar.h"
 #include "chrome/browser/pref_service.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/search_engines/template_url_model.h"
 #include "chrome/browser/tab_contents/infobar_delegate.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 175 matching lines @@
 }
 
 // static
 bool OmniboxSearchHint::IsEnabled(Profile* profile) {
   // The infobar can only be shown if the correct switch has been provided and
   // the user did not dismiss the infobar before.
   return profile->GetPrefs()->GetBoolean(prefs::kShowOmniboxSearchHint) &&
       CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kSearchInOmniboxHint);
 }