Continue with crosssite navigations if alerts are suppressed...

chrome/browser/web_contents.cc

Index: chrome/browser/web_contents.cc
===================================================================
--- chrome/browser/web_contents.cc	(revision 4898)
+++ chrome/browser/web_contents.cc	(working copy)
@@ -1067,7 +1067,8 @@
     const std::wstring& message,
     const std::wstring& default_prompt,
     const int flags,
-    IPC::Message* reply_msg) {
+    IPC::Message* reply_msg,
+    bool* did_suppress_message) {
   // Suppress javascript messages when requested and when inside a constrained
   // popup window (because that activates them and breaks them out of the
   // constrained window jail).
@@ -1075,6 +1076,8 @@
   if (delegate())
     suppress_this_message |= delegate()->IsPopup(this);
 
+  *did_suppress_message = suppress_this_message;
+
   if (!suppress_this_message) {
     TimeDelta time_since_last_message(
         TimeTicks::Now() - last_javascript_message_dismissal_);