Add a lock to the cookie accountant to prevent race conditions in patching...

ceee/ie/plugin/bho/cookie_accountant.h

Index: ceee/ie/plugin/bho/cookie_accountant.h
===================================================================
--- ceee/ie/plugin/bho/cookie_accountant.h	(revision 67716)
+++ ceee/ie/plugin/bho/cookie_accountant.h	(working copy)
@@ -13,6 +13,7 @@
 #include <string>
 
 #include "app/win/iat_patch_function.h"
+#include "base/lock.h"
 #include "base/singleton.h"
 #include "base/time.h"
 #include "ceee/ie/plugin/bho/cookie_events_funnel.h"
@@ -67,9 +68,13 @@
   }
 
   // Function patches that allow us to intercept scripted cookie changes.
+  // Protected by CookieAccountant::lock_.
   app::win::IATPatchFunction internet_set_cookie_ex_a_patch_;
   app::win::IATPatchFunction internet_set_cookie_ex_w_patch_;
 
+  // A lock that protects access to the function patches.
+  Lock lock_;
+
   // Cached singleton instance. Useful for unit testing.
   static CookieAccountant* singleton_instance_;