[DevTools] Do not expose agents on Target

third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js
index c778cd3034c7c59be72a12bdf81d1c23e7fb07b2..6953e7808f8cd26e7229e49ed941d7a692f03f08 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js
@@ -34,12 +34,13 @@
 SDK.DebuggerModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
+   * @param {!Protocol.Dispatcher} dispatcher
    */
-  constructor(target) {
-    super(target);
+  constructor(target, dispatcher) {
+    super(target, dispatcher);
 
-    target.registerDebuggerDispatcher(new SDK.DebuggerDispatcher(this));
-    this._agent = target.debuggerAgent();
+    dispatcher.registerDebuggerDispatcher(new SDK.DebuggerDispatcher(this));
+    this._agent = dispatcher.debuggerAgent();
     this._runtimeModel = /** @type {!SDK.RuntimeModel} */ (target.model(SDK.RuntimeModel));
 
     /** @type {!SDK.SourceMapManager<!SDK.Script>} */
@@ -510,7 +511,7 @@ SDK.DebuggerModel = class extends SDK.SDKModel {
       sourceURL = this._internString(sourceURL);
     }
     var script = new SDK.Script(
-        this, scriptId, sourceURL, startLine, startColumn, endLine, endColumn, executionContextId,
+        this, this._agent, scriptId, sourceURL, startLine, startColumn, endLine, endColumn, executionContextId,
         this._internString(hash), isContentScript, isLiveEdit, sourceMapURL, hasSourceURL, length);
     this._registerScript(script);
     if (!hasSyntaxError)