Cleanup: Remove more unneeded browser_thread.h includes.

chrome/browser/extensions/api/discovery/suggested_links_registry.h

 // Copyright (c) 2012 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_EXTENSIONS_API_DISCOVERY_SUGGESTED_LINKS_REGISTRY_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DISCOVERY_SUGGESTED_LINKS_REGISTRY_H_
 
 #include <map>
 
+#include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/api/discovery/suggested_link.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
-#include "content/public/browser/browser_thread.h"
 
 namespace extensions {
 
 // This class keeps track of links suggested by an extension using the discovery
 // API.
 class SuggestedLinksRegistry : public ProfileKeyedService {
  public:
   // A list of ExtensionSuggestedLink's.
   typedef std::vector<linked_ptr<extensions::SuggestedLink> > SuggestedLinkList;
 
@@ skipping 30 matching lines @@
   // An empty list of suggestions that can be returned for non-existing
   // extensions.
   SuggestedLinkList empty_list_;
 
   DISALLOW_COPY_AND_ASSIGN(SuggestedLinksRegistry);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DISCOVERY_SUGGESTED_LINKS_REGISTRY_H_