Bug 808035 - Skip session history on loading initial <about:blank>. r=ttaubert

browser/components/sessionstore/src/SessionStore.jsm

@@ -2997,7 +2997,9 @@ let SessionStoreInternal = {
       if (!tabData.entries || tabData.entries.length == 0) {
         // make sure to blank out this tab's content
         // (just purging the tab's history won't be enough)
-        browser.contentDocument.location = "about:blank";
+        browser.loadURIWithFlags("about:blank",
+                                 Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_HISTORY,
+                                 null, null, null);
         continue;
       }