[DevTools] Migrate usages of Target to RuntimeModel where makes sense

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

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
  */
 SDK.DebuggerModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
    */
   constructor(target) {
     super(target);
 
     target.registerDebuggerDispatcher(new SDK.DebuggerDispatcher(this));
     this._agent = target.debuggerAgent();
-    this._runtimeModel = target.model(SDK.RuntimeModel);
+    this._runtimeModel = /** @type {!SDK.RuntimeModel} */ (target.model(SDK.RuntimeModel));
 
     /** @type {?SDK.DebuggerPausedDetails} */
     this._debuggerPausedDetails = null;
     /** @type {!Object.<string, !SDK.Script>} */
     this._scripts = {};
     /** @type {!Map.<string, !Array.<!SDK.Script>>} */
     this._scriptsBySourceURL = new Map();
     /** @type {!Array.<!SDK.Script>} */
     this._discardableScripts = [];
 
     /** @type {!Common.Object} */
     this._breakpointResolvedEventTarget = new Common.Object();
 
     this._isPausing = false;
     Common.moduleSetting('pauseOnExceptionEnabled').addChangeListener(this._pauseOnExceptionStateChanged, this);
     Common.moduleSetting('pauseOnCaughtException').addChangeListener(this._pauseOnExceptionStateChanged, this);
     Common.moduleSetting('enableAsyncStackTraces').addChangeListener(this.asyncStackTracesStateChanged, this);
 
     /** @type {!Map<string, string>} */
     this._fileURLToNodeJSPath = new Map();
     this.enableDebugger();
 
     /** @type {!Map<string, string>} */
     this._stringMap = new Map();
   }
 
   /**
-   * @param {?SDK.Target} target
-   * @return {?SDK.DebuggerModel}
+   * @return {!SDK.RuntimeModel}
    */
-  static fromTarget(target) {
-    return target ? target.model(SDK.DebuggerModel) : null;
+  runtimeModel() {
+    return this._runtimeModel;
   }
 
   /**
    * @return {boolean}
    */
   debuggerEnabled() {
     return !!this._debuggerEnabled;
   }
 
   /**
@@ skipping 1276 matching lines @@
         stack.callFrames.shift();
       if (previous && (!stack.callFrames.length && !stack.promiseCreationFrame))
         previous.parent = stack.parent;
       else
         previous = stack;
       stack = stack.parent;
     }
     return asyncStackTrace;
   }
 };