Allow Chrome OS login profile to have different default pref values

chrome/browser/profiles/profile_impl.cc

Index: chrome/browser/profiles/profile_impl.cc
diff --git a/chrome/browser/profiles/profile_impl.cc b/chrome/browser/profiles/profile_impl.cc
index a16a24a25898da4a806b2749fc116c72e17b8f1a..aa86bf007d438220a9ed4bffaa8120d647d32980 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -104,6 +104,7 @@
 #include "chrome/browser/chromeos/locale_change_guard.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/preferences.h"
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/proxy_config_service_impl.h"
 #endif
 
@@ -275,7 +276,7 @@ int ProfileImpl::create_readme_delay_ms = 60000;
 const char* const ProfileImpl::kPrefExitTypeNormal = "Normal";
 
 // static
-void ProfileImpl::RegisterUserPrefs(
+void ProfileImpl::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterBooleanPref(
       prefs::kSavingBrowserHistoryDisabled,
@@ -397,7 +398,12 @@ ProfileImpl::ProfileImpl(
          create_mode == CREATE_MODE_SYNCHRONOUS);
   bool async_prefs = create_mode == CREATE_MODE_ASYNCHRONOUS;
 
-  chrome::RegisterUserPrefs(pref_registry_.get());
+#if defined(OS_CHROMEOS)
+  if (chromeos::ProfileHelper::IsSigninProfile(this))
+    chrome::RegisterLoginProfilePrefs(pref_registry_.get());
+  else
+#endif
+    chrome::RegisterUserProfilePrefs(pref_registry_.get());
 
   {
     // On startup, preference loading is always synchronous so a scoped timer