Fix crash when logging in with an open uber page.

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 6b9fb39b635aa55da3bb6c2e0849ecce4ccc03fd..8053a30a108e87791d7a13054d285f5198ccc41f 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -153,6 +153,7 @@
 
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 #include "chrome/browser/signin/signin_promo.h"
+#include "chrome/browser/ui/webui/foreign_session_handler.h"
 #endif
 
 #if defined(OS_CHROMEOS)
@@ -511,6 +512,10 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
 #if defined(USE_ASH)
   ash::RegisterChromeLauncherUserPrefs(registry);
 #endif
+
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
+  browser_sync::ForeignSessionHandler::RegisterProfilePrefs(registry);

[Dan Beam, 2015/05/20 18:40:02]

registering here avoids accidental double registration from multiple handlers

+#endif
 }
 
 void RegisterUserProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {