Roll eche_app from unXQyV8pI... to _2S2mhx_Q...

Release_Notes: http://go/eche-x20/relnotes/Main/eche_20211014_RC00.html

https://chrome-infra-packages.appspot.com/p/chromeos_internal/apps/eche_app/app/+/_2S2mhx_Qn-gsbcRCXjYaE3FRSoKIqzI1wTnSELm0TcC

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://skia-autoroll.corp.goog/r/eche-app-chromium
Please CC eche-app@grotations.appspotmail.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Bug: b/191410358
Tbr: eche-app@grotations.appspotmail.com
Change-Id: I575ffeb9a84de3dc1f3b1fd4e47cfd817e1042b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3225204
Commit-Queue: chromium-internal-autoroll <chromium-internal-autoroll@skia-corp.google.com.iam.gserviceaccount.com>
Bot-Commit: chromium-internal-autoroll <chromium-internal-autoroll@skia-corp.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#931870}

DEPS

@@ -1703,7 +1703,7 @@ deps = {
     'packages': [
       {
         'package': 'chromeos_internal/apps/eche_app/app',
-        'version': 'unXQyV8pIgTeejxRMHeyq7YMaXGblw89efMz2KdnhhcC',
+        'version': '_2S2mhx_Qn-gsbcRCXjYaE3FRSoKIqzI1wTnSELm0TcC',
       },
     ],
     'condition': 'checkout_chromeos and checkout_src_internal',