DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

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 826 matching lines @@
     WebInspector.TargetAware.call(this, target);
     this._debuggerModel = target.debuggerModel;
     this.scriptId = scriptId;
     this.lineNumber = lineNumber;
     this.columnNumber = columnNumber;
 }
 
 /**
  * @param {!WebInspector.Target} target
  * @param {!DebuggerAgent.Location} payload
+ * @return {!WebInspector.DebuggerModel.Location}
  */
 WebInspector.DebuggerModel.Location.fromPayload = function(target, payload)
 {
     return new WebInspector.DebuggerModel.Location(target, payload.scriptId, payload.lineNumber, payload.columnNumber);
 }
 
 WebInspector.DebuggerModel.Location.prototype = {
     /**
      * @return {!DebuggerAgent.Location}
      */
@@ skipping 305 matching lines @@
             this.asyncStackTrace.dispose();
     },
 
     __proto__: WebInspector.TargetAware.prototype
 }
 
 /**
  * @type {!WebInspector.DebuggerModel}
  */
 WebInspector.debuggerModel;