Restore thread check in KeyedService factories.

components/keyed_service/ios/browser_state_keyed_service_factory.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/keyed_service/ios/browser_state_keyed_service_factory.h"
 
 #include "base/logging.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/keyed_service/ios/browser_state_dependency_manager.h"
 #include "ios/web/public/browser_state.h"
@@ skipping 24 matching lines @@
 }
 
 KeyedService* BrowserStateKeyedServiceFactory::GetServiceForBrowserState(
     web::BrowserState* context,
     bool create) {
   return KeyedServiceFactory::GetServiceForContext(context, create);
 }
 
 web::BrowserState* BrowserStateKeyedServiceFactory::GetBrowserStateToUse(
     web::BrowserState* context) const {
-  // TODO(crbug.com/701326): This DCHECK should be moved to GetContextToUse().
-  DCHECK(CalledOnValidThread());
-
   // Safe default for Incognito mode: no service.
   if (context->IsOffTheRecord())
     return nullptr;
 
   return context;
 }
 
 bool BrowserStateKeyedServiceFactory::ServiceIsCreatedWithBrowserState() const {
   return KeyedServiceBaseFactory::ServiceIsCreatedWithContext();
 }
@@ skipping 18 matching lines @@
   return BuildServiceInstanceFor(static_cast<web::BrowserState*>(context));
 }
 
 bool BrowserStateKeyedServiceFactory::IsOffTheRecord(
     base::SupportsUserData* context) const {
   return static_cast<web::BrowserState*>(context)->IsOffTheRecord();
 }
 
 base::SupportsUserData* BrowserStateKeyedServiceFactory::GetContextToUse(
     base::SupportsUserData* context) const {
+  DCHECK(CalledOnValidThread());
   AssertContextWasntDestroyed(context);
   return GetBrowserStateToUse(static_cast<web::BrowserState*>(context));
 }
 
 bool BrowserStateKeyedServiceFactory::ServiceIsCreatedWithContext() const {
   return ServiceIsCreatedWithBrowserState();
 }
 
 void BrowserStateKeyedServiceFactory::ContextShutdown(
     base::SupportsUserData* context) {
   BrowserStateShutdown(static_cast<web::BrowserState*>(context));
 }
 
 void BrowserStateKeyedServiceFactory::ContextDestroyed(
     base::SupportsUserData* context) {
   BrowserStateDestroyed(static_cast<web::BrowserState*>(context));
 }
 
 void BrowserStateKeyedServiceFactory::RegisterPrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   RegisterBrowserStatePrefs(registry);
 }