Convert TrackedPreferenceValidationDelegate into a mojo interface.

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"
+#include "services/preferences/public/interfaces/tracked_preference_validation_delegate.mojom.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)
+    prefs::mojom::TrackedPreferenceValidationDelegate* delegate)
     : pref_path_(pref_path),
       helper_(pref_path,
               reporting_id,
               reporting_ids_count,
               enforcement_level,
               value_type),
-      delegate_(delegate) {
-}
+      delegate_(delegate) {}
 
 TrackedPreferenceType TrackedAtomicPreference::GetType() const {
   return TrackedPreferenceType::ATOMIC;
 }
 
 void TrackedAtomicPreference::OnNewValue(
     const base::Value* value,
     PrefHashStoreTransaction* transaction) const {
   transaction->StoreHash(pref_path_, value);
 }
@@ skipping 12 matching lines @@
       PrefHashStoreTransaction::UNSUPPORTED;
   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());
   }
 
   if (delegate_) {
-    delegate_->OnAtomicPreferenceValidation(pref_path_, value, value_state,
-                                            external_validation_value_state,
-                                            helper_.IsPersonal());
+    delegate_->OnAtomicPreferenceValidation(
+        pref_path_, value ? value->CreateDeepCopy() : nullptr, value_state,
+        external_validation_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;
   }
@@ skipping 11 matching lines @@
       (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;
 }