Check BrowsingInstance before swapping prerenders.

chrome/browser/prerender/prerender_final_status.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/prerender/prerender_final_status.h"
 
 #include "chrome/browser/prerender/prerender_manager.h"
 
 namespace prerender {
 
@@ skipping 43 matching lines @@
   "OpenURL",
   "WouldHaveBeenUsed",
   "Register Protocol Handler",
   "Creating Audio Stream",
   "Page Being Captured",
   "Bad Deferred Redirect",
   "Navigation Uncommitted",
   "New Navigation Entry",
   "Cookie Store Not Loaded",
   "Cookie Conflict",
+  "Non-Empty Browsing Instance",
   "Max",
 };
 COMPILE_ASSERT(arraysize(kFinalStatusNames) == FINAL_STATUS_MAX + 1,
                PrerenderFinalStatus_name_count_mismatch);
 
 }  // namespace
 
 const char* NameFromFinalStatus(FinalStatus final_status) {
   DCHECK_LT(static_cast<unsigned int>(final_status),
             arraysize(kFinalStatusNames));
   return kFinalStatusNames[final_status];
 }
 
 }  // namespace prerender