Delete most web intents code.

chrome/browser/intents/intent_service_host.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_INTENTS_INTENT_SERVICE_HOST_H_
-#define CHROME_BROWSER_INTENTS_INTENT_SERVICE_HOST_H_
-
-class GURL;
-
-namespace content {
-class WebIntentsDispatcher;
-}
-
-namespace web_intents {
-
-// Interface allowing services to be implemented in various host environments.
-class IntentServiceHost {
- public:
-  virtual ~IntentServiceHost() {}
-
-  // Handle all necessary service-side processing of an intent. A service
-  // can reply to the intent via |dispatcher|.
-  virtual void HandleIntent(content::WebIntentsDispatcher* dispatcher) = 0;
-};
-
-}  // namespace web_intents
-
-#endif  // CHROME_BROWSER_INTENTS_INTENT_SERVICE_HOST_H_