Fix comment in ContentBrowserClient::CreateURLLoaderThrottles

Change-Id: I5f171e2c769be38ffc5f2a8c63230071163235a5
Reviewed-on: https://chromium-review.googlesource.com/1114152Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570334}

content/public/browser/content_browser_client.h

@@ -1019,7 +1019,8 @@ class CONTENT_EXPORT ContentBrowserClient {
   GetTaskSchedulerInitParams();
 
   // Allows the embedder to register one or more URLLoaderThrottles for a
-  // URL request. This is used only when --enable-network-service is in effect.
+  // navigation request.
+  // This is called both when the network service is enabled and disabled.
   // This is called on the IO thread.
   virtual std::vector<std::unique_ptr<URLLoaderThrottle>>
   CreateURLLoaderThrottles(