DevTools: add a mixed-content filter

Source/devtools/front_end/sdk/NetworkRequest.js

 /*
  * Copyright (C) 2012 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 42 matching lines @@
     this._initiator = initiator;
     this._issueTime = -1;
     this._startTime = -1;
     this._endTime = -1;
 
     this.statusCode = 0;
     this.statusText = "";
     this.requestMethod = "";
     this.requestTime = 0;
     this.protocol = "";
+    this.mixedContentType = "";
 
     /** @type {?NetworkAgent.ResourcePriority} */
     this._initialPriority = null;
 
     /** @type {!WebInspector.ResourceType} */
     this._resourceType = WebInspector.resourceTypes.Other;
     this._contentEncoded = false;
     this._pendingContentCallbacks = [];
     /** @type {!Array.<!WebInspector.NetworkRequest.WebSocketFrame>} */
     this._frames = [];
@@ skipping 1057 matching lines @@
         this.dispatchEventToListeners(WebInspector.NetworkRequest.Events.EventSourceMessageAdded, message);
     },
 
     replayXHR: function()
     {
         this.target().networkAgent().replayXHR(this.requestId);
     },
 
     __proto__: WebInspector.SDKObject.prototype
 }