Bug 1039904 - Changing the URL in a pinned tab shouldn't open a new tab. r=gavin

browser/base/content/utilityOverlay.js

@@ -185,6 +185,7 @@ function whereToOpenLink( e, ignoreButton, ignoreAlt )
  *   referrerURI          (nsIURI)
  *   relatedToCurrent     (boolean)
  *   skipTabAnimation     (boolean)
+ *   allowPinnedTabHostChange (boolean)
  */
 function openUILinkIn(url, where, aAllowThirdPartyFixup, aPostData, aReferrerURI) {
   var params;
@@ -220,6 +221,7 @@ function openLinkIn(url, where, params) {
   var aInitiatingDoc        = params.initiatingDoc;
   var aIsPrivate            = params.private;
   var aSkipTabAnimation     = params.skipTabAnimation;
+  var aAllowPinnedTabHostChange = !!params.allowPinnedTabHostChange;
 
   if (where == "save") {
     if (!aInitiatingDoc) {
@@ -288,7 +290,8 @@ function openLinkIn(url, where, params) {
     } catch (e) {}
   }
 
-  if (where == "current" && w.gBrowser.selectedTab.pinned) {
+  if (where == "current" && w.gBrowser.selectedTab.pinned &&
+      !aAllowPinnedTabHostChange) {
     try {
       // nsIURI.host can throw for non-nsStandardURL nsIURIs.
       if (!uriObj || (!uriObj.schemeIs("javascript") &&