Update mojo sdk to rev cb6c5abfadfea0ca73dca466e2894554ac1ae144

R=brettw@chromium.org, erg@chromium.org, jamesr@chromium.org
TBR=jamesr@chromium.org

Review URL: https://codereview.chromium.org/1029113005

Cr-Original-Commit-Position: refs/heads/master@{#322083}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: e912c8f996d898a1232d885988a54010f8ed0105

module_args/mojo.gni

@@ -13,6 +13,9 @@ build_network_service_from_source = true
 # depend on the apptest framework.
 disable_dart_apptest_framework = true
 
+# Points to the directory network_service is built from.
+network_service_root = "//mojo/services"
+
 declare_args() {
   # Specify prebuilt network service mojo file location rather than download
   # from gs://mojo.