Revert of Integrate registry_hash_store_contents with the rest of tracked prefs.

components/user_prefs/tracked/tracked_atomic_preference.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/user_prefs/tracked/tracked_atomic_preference.h"
 
 #include "base/values.h"
 #include "components/user_prefs/tracked/pref_hash_store_transaction.h"
 #include "components/user_prefs/tracked/tracked_preference_validation_delegate.h"
 
 TrackedAtomicPreference::TrackedAtomicPreference(
     const std::string& pref_path,
     size_t reporting_id,
     size_t reporting_ids_count,
     PrefHashFilter::EnforcementLevel enforcement_level,
     PrefHashFilter::ValueType value_type,
     TrackedPreferenceValidationDelegate* delegate)
     : pref_path_(pref_path),
       helper_(pref_path,
               reporting_id,
               reporting_ids_count,
               enforcement_level,
               value_type),
       delegate_(delegate) {
 }
 
-TrackedPreferenceType TrackedAtomicPreference::GetType() const {
-  return TrackedPreferenceType::ATOMIC;
-}
-
 void TrackedAtomicPreference::OnNewValue(
     const base::Value* value,
     PrefHashStoreTransaction* transaction) const {
   transaction->StoreHash(pref_path_, value);
 }
 
 bool TrackedAtomicPreference::EnforceAndReport(
     base::DictionaryValue* pref_store_contents,
-    PrefHashStoreTransaction* transaction,
-    PrefHashStoreTransaction* external_validation_transaction) const {
+    PrefHashStoreTransaction* transaction) const {
   const base::Value* value = NULL;
   pref_store_contents->Get(pref_path_, &value);
   PrefHashStoreTransaction::ValueState value_state =
       transaction->CheckValue(pref_path_, value);
+
   helper_.ReportValidationResult(value_state, transaction->GetStoreUMASuffix());
 
-  PrefHashStoreTransaction::ValueState external_validation_value_state =
-      PrefHashStoreTransaction::UNCHANGED;
-  if (external_validation_transaction) {
-    external_validation_value_state =
-        external_validation_transaction->CheckValue(pref_path_, value);
-    helper_.ReportValidationResult(
-        external_validation_value_state,
-        external_validation_transaction->GetStoreUMASuffix());
-
-    // TODO(proberge): Call delegate_->OnAtomicPreferenceValidation.
-  }
-
+  TrackedPreferenceHelper::ResetAction reset_action =
+      helper_.GetAction(value_state);
   if (delegate_) {
     delegate_->OnAtomicPreferenceValidation(pref_path_, value, value_state,
                                             helper_.IsPersonal());
   }
-  TrackedPreferenceHelper::ResetAction reset_action =
-      helper_.GetAction(value_state);
   helper_.ReportAction(reset_action);
 
   bool was_reset = false;
   if (reset_action == TrackedPreferenceHelper::DO_RESET) {
     pref_store_contents->RemovePath(pref_path_, NULL);
     was_reset = true;
   }
 
   if (value_state != PrefHashStoreTransaction::UNCHANGED) {
     // Store the hash for the new value (whether it was reset or not).
     const base::Value* new_value = NULL;
     pref_store_contents->Get(pref_path_, &new_value);
     transaction->StoreHash(pref_path_, new_value);
   }
 
-  // Update MACs in the external store if there is one and there either was a
-  // reset or external validation failed.
-  if (external_validation_transaction &&
-      (was_reset ||
-       external_validation_value_state !=
-           PrefHashStoreTransaction::UNCHANGED)) {
-    const base::Value* new_value = nullptr;
-    pref_store_contents->Get(pref_path_, &new_value);
-    external_validation_transaction->StoreHash(pref_path_, new_value);
-  }
-
   return was_reset;
 }