Misc undefined symbol fixes for Android+LTO.

chrome/browser/search/instant_service.h

 // Copyright 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.
 
 #ifndef CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_
 #define CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 117 matching lines @@
   void OnRendererProcessTerminated(int process_id);
 
   // Called when we get new most visited items from TopSites, registered as an
   // async callback. Parses them and sends them to the renderer via
   // SendMostVisitedItems.
   void OnMostVisitedItemsReceived(const history::MostVisitedURLList& data);
 
   // Notifies the observer about the last known most visited items.
   void NotifyAboutMostVisitedItems();
 
+#if defined(ENABLE_THEMES)
   // Theme changed notification handler.
   void OnThemeChanged(ThemeService* theme_service);
+#endif
 
   void ResetInstantSearchPrerenderer();
 
   Profile* const profile_;
 
   // The TemplateURLService that we are observing. It will outlive this
   // InstantService due to the dependency declared in InstantServiceFactory.
   TemplateURLService* template_url_service_;
 
   // The process ids associated with Instant processes.
@@ skipping 23 matching lines @@
   scoped_ptr<TemplateURLData> previous_default_search_provider_;
   GURL previous_google_base_url_;
 
   // Used for Top Sites async retrieval.
   base::WeakPtrFactory<InstantService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantService);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_INSTANT_SERVICE_H_