Update network service about:flags message.

Most features work now.

Change-Id: I3e3d73ff98fafa567bb66162eb4ab30a75739ee3
Reviewed-on: https://chromium-review.googlesource.com/1213278Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589696}

chrome/browser/flag_descriptions.cc

@@ -629,7 +629,7 @@ const char kEnableNetworkLoggingToFileDescription[] =
 const char kEnableNetworkServiceName[] = "Enable network service";
 const char kEnableNetworkServiceDescription[] =
     "Enables the network service, which makes network requests through a "
-    "separate service. Note: most features don't work with this yet.";
+    "separate process.";
 
 const char kEnableNetworkServiceInProcessName[] =
     "Runs network service in-process";