Switch to standard integer types in components/, part 3 of 4.

components/pref_registry/pref_registry_syncable.cc

Index: components/pref_registry/pref_registry_syncable.cc
diff --git a/components/pref_registry/pref_registry_syncable.cc b/components/pref_registry/pref_registry_syncable.cc
index bb90417d33dc688ffe7ca3c28e4db71d16cda709..ce15ea0debeefad3e1a2431b3d3093c555888c22 100644
--- a/components/pref_registry/pref_registry_syncable.cc
+++ b/components/pref_registry/pref_registry_syncable.cc
@@ -24,7 +24,7 @@ void PrefRegistrySyncable::SetSyncableRegistrationCallback(
 
 void PrefRegistrySyncable::OnPrefRegistered(const std::string& path,
                                             base::Value* default_value,
-                                            uint32 flags) {
+                                            uint32_t flags) {
   // Tests that |flags| does not contain both SYNCABLE_PREF and
   // SYNCABLE_PRIORITY_PREF flags at the same time.
   DCHECK(!(flags & PrefRegistrySyncable::SYNCABLE_PREF) ||