Upgrade all call sites of PageNavigator::OpenURL that pass a referrer to use OpenURLParams

content/browser/tab_contents/tab_contents.cc

Index: content/browser/tab_contents/tab_contents.cc
diff --git a/content/browser/tab_contents/tab_contents.cc b/content/browser/tab_contents/tab_contents.cc
index b9fba7064782c46f9bdb745ab755ec6455d2fc4f..284ea262ceb60729a025007b63b7a9ee33e3a504 100644
--- a/content/browser/tab_contents/tab_contents.cc
+++ b/content/browser/tab_contents/tab_contents.cc
@@ -573,6 +573,8 @@ TabContents* TabContents::OpenURL(const GURL& url,
                                   const GURL& referrer,
                                   WindowOpenDisposition disposition,
                                   content::PageTransition transition) {
+  // For specifying a referrer, use the version of OpenURL taking OpenURLParams.
+  DCHECK(referrer.is_empty());
   return OpenURL(OpenURLParams(url, referrer, disposition, transition,
                                false));
 }