chore: bump chromium to 140.0.7339.16 (38-x-y) (#48075)

* chore: bump chromium in DEPS to 140.0.7339.16

* chore: update patches

* Remove ELECTRON_OZONE_PLATFORM_HINT env var

6819616: Remove OzonePlatformHint | https://chromium-review.googlesource.com/c/chromium/src/+/6819616

See: https://github.com/electron/electron/issues/48001
(cherry picked from commit d9dad43050)

* Remove `DESKTOP_STARTUP_ID` code

This was removed upstream in https://chromium-review.googlesource.com/c/chromium/src/+/6819616 and I confirmed with the author that it was an intentional change. Going to mirror upstream and remove it here too.

(cherry picked from commit 8fffb83c11)

---------

Co-authored-by: electron-roller[bot] <84116207+electron-roller[bot]@users.noreply.github.com>
Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>
Co-authored-by: clavin <clavin@electronjs.org>

DEPS

@@ -2,7 +2,7 @@ gclient_gn_args_from = 'src'
 
 vars = {
   'chromium_version':
-    '140.0.7339.2',
+    '140.0.7339.16',
   'node_version':
     'v22.18.0',
   'nan_version':