[DevTools] Do not expose agents on Target

third_party/WebKit/Source/devtools/front_end/screencast/InputModel.js

 // Copyright 2017 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.
 
 Screencast.InputModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
+   * @param {!Protocol.Dispatcher} dispatcher
    */
-  constructor(target) {
-    super(target);
-    this._inputAgent = target.inputAgent();
+  constructor(target, dispatcher) {
+    super(target, dispatcher);
+    this._inputAgent = dispatcher.inputAgent();
     /** @type {?number} */
     this._activeTouchOffsetTop = null;
     this._activeTouchParams = null;
   }
 
   /**
    * @param {!Event} event
    */
   emitKeyEvent(event) {
     var type;
@@ skipping 85 matching lines @@
   /**
    * @param {!Event} event
    * @return {number}
    */
   _modifiersForEvent(event) {
     return (event.altKey ? 1 : 0) | (event.ctrlKey ? 2 : 0) | (event.metaKey ? 4 : 0) | (event.shiftKey ? 8 : 0);
   }
 };
 
 SDK.SDKModel.register(Screencast.InputModel, SDK.Target.Capability.Input, false);