Add a mojo bridge for PersistentPrefStore.

chrome/browser/profiles/profile_impl.cc

 // Copyright (c) 2012 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 "chrome/browser/profiles/profile_impl.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 462 matching lines @@
       SupervisedUserSettingsServiceFactory::GetForProfile(this);
   supervised_user_settings->Init(
       path_, sequenced_task_runner, create_mode == CREATE_MODE_SYNCHRONOUS);
 #endif
 
   scoped_refptr<safe_browsing::SafeBrowsingService> safe_browsing_service(
       g_browser_process->safe_browsing_service());
   if (safe_browsing_service.get()) {
     pref_validation_delegate_ =
         safe_browsing_service->CreatePreferenceValidationDelegate(this);
+    if (pref_validation_delegate_) {
+      pref_validation_delegate_weak_factory_ = base::MakeUnique<
+          base::WeakPtrFactory<TrackedPreferenceValidationDelegate>>(
+          pref_validation_delegate_.get());
+    }
   }
 
   content::BrowserContext::Initialize(this, path_);
 
   {
     prefs_ = chrome_prefs::CreateProfilePrefs(
-        path_, sequenced_task_runner, pref_validation_delegate_.get(),
+        path_, sequenced_task_runner,
+        pref_validation_delegate_weak_factory_
+            ? pref_validation_delegate_weak_factory_->GetWeakPtr()
+            : base::WeakPtr<TrackedPreferenceValidationDelegate>(),
         profile_policy_connector_->policy_service(), supervised_user_settings,
         CreateExtensionPrefStore(this, false), pref_registry_, async_prefs);
     // Register on BrowserContext.
     user_prefs::UserPrefs::Set(this, prefs_.get());
   }
 
   if (async_prefs) {
     // Wait for the notification that prefs has been loaded
     // (successfully or not).  Note that we can use base::Unretained
     // because the PrefService is owned by this class and lives on
@@ skipping 789 matching lines @@
 ProfileImpl::CreateDomainReliabilityMonitor(PrefService* local_state) {
   domain_reliability::DomainReliabilityService* service =
       domain_reliability::DomainReliabilityServiceFactory::GetInstance()->
           GetForBrowserContext(this);
   if (!service)
     return std::unique_ptr<domain_reliability::DomainReliabilityMonitor>();
 
   return service->CreateMonitor(
       BrowserThread::GetTaskRunnerForThread(BrowserThread::IO));
 }