[DevTools] Remove Common.Event.target field.

third_party/WebKit/Source/devtools/front_end/bindings/BreakpointManager.js

 /*
  * Copyright (C) 2011 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 155 matching lines @@
    */
   _uiSourceCodeRemoved(event) {
     var uiSourceCode = /** @type {!Workspace.UISourceCode} */ (event.data);
     this._removeUISourceCode(uiSourceCode);
   }
 
   /**
    * @param {!Common.Event} event
    */
   _uiSourceCodeMappingChanged(event) {
-    var uiSourceCode = /** @type {!Workspace.UISourceCode} */ (event.target);
+    var uiSourceCode = /** @type {!Workspace.UISourceCode} */ (event.data.uiSourceCode);
     var isIdentity = /** @type {boolean} */ (event.data.isIdentity);
     var target = /** @type {!SDK.Target} */ (event.data.target);
     if (isIdentity)
       return;
     var breakpoints = this._breakpointsForPrimaryUISourceCode.get(uiSourceCode) || [];
     for (var i = 0; i < breakpoints.length; ++i)
       breakpoints[i]._updateInDebuggerForTarget(target);
   }
 
   /**
@@ skipping 901 matching lines @@
     this.url = breakpoint._url;
     this.lineNumber = breakpoint.lineNumber();
     this.columnNumber = breakpoint.columnNumber();
     this.condition = breakpoint.condition();
     this.enabled = breakpoint.enabled();
   }
 };
 
 /** @type {!Bindings.BreakpointManager} */
 Bindings.breakpointManager;