Don't sync homepage pref to mobile platforms.

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 c859b1fe498fbcfdf72075eb9168129d83a92422..2fffbe8d87c2d5e07bfa06929ae6e6005a233368 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -369,9 +369,14 @@ void ProfileImpl::RegisterProfilePrefs(
 #endif
 
   registry->RegisterStringPref(prefs::kSupervisedUserId, std::string());
+#if defined(OS_IOS) || defined(OS_ANDROID)
+  uint32_t home_page_flags = PrefRegistry::NO_REGISTRATION_FLAGS;
+#else
+  uint32_t home_page_flags = user_prefs::PrefRegistrySyncable::SYNCABLE_PREF;
+#endif
   registry->RegisterStringPref(prefs::kHomePage,
                                std::string(),
-                               user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+                               home_page_flags);
 #if defined(ENABLE_PRINTING)
   registry->RegisterBooleanPref(prefs::kPrintingEnabled, true);
 #endif