Fix up unused includes from chrome/browser/extensions to the rest of chrome/browser.

chrome/browser/extensions/activity_actions.h

 // Copyright (c) 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_EXTENSIONS_ACTIVITY_ACTIONS_H_
 #define CHROME_BROWSER_EXTENSIONS_ACTIVITY_ACTIONS_H_
 
 #include <string>
 #include "base/memory/ref_counted_memory.h"
 #include "base/time.h"
 #include "base/values.h"
-#include "chrome/browser/history/url_database.h"
 #include "sql/connection.h"
+#include "sql/statement.h"
 #include "sql/transaction.h"
 
 namespace extensions {
 
 // This is the interface for extension actions that are to be recorded in
 // the activity log.
 class Action : public base::RefCountedThreadSafe<Action> {
  public:
   static const char* kTableBasicFields;
 
@@ skipping 27 matching lines @@
 
   std::string extension_id_;
   base::Time time_;
 
   DISALLOW_COPY_AND_ASSIGN(Action);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_ACTIONS_H_
-