Update mojo sdk to rev 1dc8a9a5db73d3718d99917fadf31f5fb2ebad4f

Relanding this. Was reverted due to some type conversion errors
on Win x64 GN dbg (guess because MSVS 2012?)

Just noticed the revert. Will upstream the Mojo fix later.

BUG=None
TBR=jam@chromium.org

Review URL: https://codereview.chromium.org/1157843002

Cr-Original-Commit-Position: refs/heads/master@{#331246}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7b6d64a6dabbba0f2ce3dd4429fdc79d4aabc898

module_args/mojo.gni

@@ -16,6 +16,9 @@ mojo_disable_dart_apptest_framework = true
 # Points to the directory network_service is built from.
 mojo_network_service_root = "//mojo/services"
 
+# We use our own custom application code. Don't build Mojo's.
+mojo_disable_application_in_sdk = true
+
 declare_args() {
   # The mojo shell is forked and built in the chromium repo.
   mojo_build_mojo_shell_from_source = true