diff --git chrome/browser/profiles/profile_manager.h chrome/browser/profiles/profile_manager.h
index e3e742c..aabe932 100644
--- chrome/browser/profiles/profile_manager.h
+++ chrome/browser/profiles/profile_manager.h
@@ -117,7 +117,7 @@ class ProfileManager : public base::NonThreadSafe,
 
   // Returns true if the profile pointer is known to point to an existing
   // profile.
-  bool IsValidProfile(const void* profile);
+  virtual bool IsValidProfile(const void* profile);
 
   // Returns the directory where the first created profile is stored,
   // relative to the user data directory currently in use.