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_
-
-namespace content {
-class WebIntentsDispatcher;
-}
-
-namespace web_intents {
-
-// Interface for web intent "services" that act as handlers for
-// web intents invoked by client code or other means. "services" can
-// be implemented in a variety of means across different "host" environments
-// Examples:
-// * In another tab, where the tab hosts a web page that services the
-//   intent.
-// * In the Chrome browser where a file picker can be used to select
-//   a file from disk in response to a "pick" action.
-// * In the underlying OS where a native application could be used
-//   to handle an intent.
-//
-// A "service" is selected by policy, based on a heuristic including:
-// user selection, system defaults, declaration as an "explicit" intent
-// by client code, and other means. This selection process is managed
-// by WebInentPickerController.
-//
-// A service, once selected, is responsible for responding to an intent.
-// The "intent" is presented to the service as an instance of
-// WebIntentsDispatcher. The dispatcher provides access to the intent data
-// in the form of a webkit_glue::WebIntentData. The dispatcher also provides
-// the service a means of responding to the intent.
-//
-// A service instance is owned by WebIntentPickerController. Its lifetime is a
-// subset of the life of an intent. It will be created immediately prior
-// to calling HandleIntent, and destroyed immediately after SendReply
-// is called.
-//
-// For details see content::WebIntentsDispatcher and webkit_glue::WebIntentData
-class IntentServiceHost {
- public:
-  virtual ~IntentServiceHost() {}
-
-  // A service is responsible for replying to the dispatcher in all
-  // circumstances, including when the user has canceled the operation,
-  // or the action was terminated without user intervention. In each of
-  // these cases the correct webkit_glue::WebIntentReplyType should
-  // be chosen and a response should be delivered to the dispatcher
-  // via SendReply(webkit_glue::WebIntentReply).
-  virtual void HandleIntent(content::WebIntentsDispatcher* dispatcher) = 0;
-};
-
-}  // namespace web_intents
-
-#endif  // CHROME_BROWSER_INTENTS_INTENT_SERVICE_HOST_H_