Restore thread check in KeyedService factories.

components/keyed_service/content/refcounted_browser_context_keyed_service_factory.cc

Index: components/keyed_service/content/refcounted_browser_context_keyed_service_factory.cc
diff --git a/components/keyed_service/content/refcounted_browser_context_keyed_service_factory.cc b/components/keyed_service/content/refcounted_browser_context_keyed_service_factory.cc
index 7778de8abeec12788420809f63bc2abe467f9326..264fb3635f90243720f6f60698d8fa4a125d7dd8 100644
--- a/components/keyed_service/content/refcounted_browser_context_keyed_service_factory.cc
+++ b/components/keyed_service/content/refcounted_browser_context_keyed_service_factory.cc
@@ -49,9 +49,6 @@ RefcountedBrowserContextKeyedServiceFactory::GetServiceForBrowserContext(
 content::BrowserContext*
 RefcountedBrowserContextKeyedServiceFactory::GetBrowserContextToUse(
     content::BrowserContext* 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;
@@ -94,6 +91,7 @@ bool RefcountedBrowserContextKeyedServiceFactory::IsOffTheRecord(
 base::SupportsUserData*
 RefcountedBrowserContextKeyedServiceFactory::GetContextToUse(
     base::SupportsUserData* context) const {
+  DCHECK(CalledOnValidThread());
   AssertContextWasntDestroyed(context);
   return GetBrowserContextToUse(static_cast<content::BrowserContext*>(context));
 }