Change EditorMeasurement to use secure connection (#548)

Author: chkuang-g

source/VersionHandlerImpl/src/EditorMeasurement.cs

@@ -514,7 +514,7 @@ public void Report(string reportUrl, string reportName) {
                     if (String.IsNullOrEmpty(cookie.Key)) continue;
                     // See https://developers.google.com/analytics/devguides/collection/protocol/v1
                     var status = PortableWebRequest.DefaultInstance.Post(
-                        "http://www.google-analytics.com/collect",
+                        "https://www.google-analytics.com/collect",
                         new[] {
                             // Version
                             new KeyValuePair<string, string>("v", "1"),

source/VersionHandlerImpl/unit_tests/src/EditorMeasurementTest.cs

@@ -366,7 +366,7 @@ public void ReportWhenDisabled() {
         private KeyValuePair<string, string> CreateMeasurementEvent(
                 string reportUrl, string reportName, string cookie) {
             return new KeyValuePair<string, string>(
-                String.Format("http://www.google-analytics.com/collect" +
+                String.Format("https://www.google-analytics.com/collect" +
                               "?v=1" +
                               "&tid={0}" +
                               "&cid={1}" +