[DevTools] Added serverIPaddress to HAR output

third_party/WebKit/LayoutTests/http/tests/inspector/resource-har-headers-expected.txt

 Tests the nondeterministic bits of HAR conversion via the magic of hard-coded values.
 
 Resource:{
     request : {
         headers : [
             {
                 name : "Request"
                 value : "request-value"
             }
         ]
@@ skipping 48 matching lines @@
                 name : "Response"
                 value : "response-value"
             }
         ]
         headersSize : 39
         httpVersion : "HTTP/1.1"
         redirectURL : ""
         status : 200
         statusText : "OK"
     }
+    serverIPAddress : ""
     startedDateTime : <object>
     time : <number>
     timings : <object>
 }