Fix typo in GetNetworkService() comment

Fix typo in GetNetworkService() comment,
typo in the phrase `don't want to want to start`.

BUG=none
TEST=none

Change-Id: I7448ab0d565ec53e31f883a717b1a8282e43899b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954014Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Oleh Lamzin <lamzin@google.com>
Cr-Commit-Position: refs/heads/master@{#722502}

content/browser/network_service_instance_impl.cc

@@ -251,9 +251,9 @@ network::mojom::NetworkService* GetNetworkService() {
     if (GetContentClient()->browser()->IsShuttingDown()) {
       // This happens at system shutdown, since in other scenarios the network
       // process would only be torn down once the message loop stopped running.
-      // We don't want to want to start the network service again so just create
-      // message pipe that's not bound to stop consumers from requesting
-      // creation of the service.
+      // We don't want to start the network service again so just create message
+      // pipe that's not bound to stop consumers from requesting creation of the
+      // service.
       auto receiver = g_network_service_remote->BindNewPipeAndPassReceiver();
       auto leaked_pipe = receiver.PassPipe().release();
     } else {