Don't sync default_search_provider.synced_guid to mobile.

components/search_engines/template_url_service.cc

Index: components/search_engines/template_url_service.cc
diff --git a/components/search_engines/template_url_service.cc b/components/search_engines/template_url_service.cc
index 064a37db4e6f676893e7b158ee616a6d1c8d2943..a3e0663a34a0d62202f5c8254478e969e5ed5551 100644
--- a/components/search_engines/template_url_service.cc
+++ b/components/search_engines/template_url_service.cc
@@ -283,9 +283,14 @@ TemplateURLService::~TemplateURLService() {
 // static
 void TemplateURLService::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
+#if defined(OS_IOS) || defined(OS_ANDROID)
+  uint32_t flags = PrefRegistry::NO_REGISTRATION_FLAGS;
+#else
+  uint32_t flags = user_prefs::PrefRegistrySyncable::SYNCABLE_PREF;
+#endif
   registry->RegisterStringPref(prefs::kSyncedDefaultSearchProviderGUID,
                                std::string(),
-                               user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+                               flags);
   registry->RegisterBooleanPref(prefs::kDefaultSearchProviderEnabled, true);
   registry->RegisterStringPref(prefs::kDefaultSearchProviderName,
                                std::string());