[DevTools] Save as HAR: classify time before network activity as "blocked".

Source/devtools/front_end/NetworkRequest.js

Index: Source/devtools/front_end/NetworkRequest.js
diff --git a/Source/devtools/front_end/NetworkRequest.js b/Source/devtools/front_end/NetworkRequest.js
index 8203cf65708aa64dbe06b55dbd4a1c6824a8ed28..f3c57b5b2df59f2dd682321804ce438e2427af73 100644
--- a/Source/devtools/front_end/NetworkRequest.js
+++ b/Source/devtools/front_end/NetworkRequest.js
@@ -52,7 +52,6 @@ WebInspector.NetworkRequest = function(requestId, url, documentURL, frameId, loa
     this.statusText = "";
     this.requestMethod = "";
     this.requestTime = 0;
-    this.receiveHeadersEnd = 0;
 
     this._type = WebInspector.resourceTypes.Other;
     this._contentEncoded = false;
@@ -213,16 +212,6 @@ WebInspector.NetworkRequest.prototype = {
     /**
      * @return {number}
      */
-    get receiveDuration()
-    {
-        if (this._endTime === -1 || this._responseReceivedTime === -1)
-            return -1;
-        return this._endTime - this._responseReceivedTime;
-    },
-
-    /**
-     * @return {number}
-     */
     get resourceSize()
     {
         return this._resourceSize || 0;