Plumb the referrer throughout the OpenURL APIs....

chrome/browser/tab_contents.cc

Index: chrome/browser/tab_contents.cc
===================================================================
--- chrome/browser/tab_contents.cc	(revision 3991)
+++ chrome/browser/tab_contents.cc	(working copy)
@@ -242,11 +242,11 @@
     delegate_->ActivateContents(this);
 }
 
-void TabContents::OpenURL(const GURL& url,
+void TabContents::OpenURL(const GURL& url, const GURL& referrer,
                           WindowOpenDisposition disposition,
                           PageTransition::Type transition) {
   if (delegate_)
-    delegate_->OpenURLFromTab(this, url, disposition, transition);
+    delegate_->OpenURLFromTab(this, url, referrer, disposition, transition);
 }
 
 bool TabContents::NavigateToPendingEntry(bool reload) {
@@ -454,9 +454,10 @@
 
 void TabContents::OpenURL(ConstrainedWindow* window,
                           const GURL& url,
+                          const GURL& referrer,
                           WindowOpenDisposition disposition,
                           PageTransition::Type transition) {
-  OpenURL(url, disposition, transition);
+  OpenURL(url, referrer, disposition, transition);
 }
 
 void TabContents::WillClose(ConstrainedWindow* window) {