Roll Help App from qJhtBw7ou... to nmFhO5_ZT...

Release_Notes: http://go/help_app-x20/relnotes/Main/help_app_nightly_202012260600_RC00.html

https://chrome-infra-packages.appspot.com/p/chromeos_internal/apps/help_app/app/+/nmFhO5_ZTTtPNJGhEylXtJ4sG_lvSsW7CgsI4mn7xzoC

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://skia-autoroll.corp.goog/r/help-app-chromium-autoroll
Please CC help-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/master/autoroll/README.md

Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Bug: None
Tbr: help-app@grotations.appspotmail.com
Change-Id: Ie9498b2cb362111ce2000bbebe64b7df00d54db5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2603404Reviewed-by: chromium-internal-autoroll <chromium-internal-autoroll@skia-corp.google.com.iam.gserviceaccount.com>
Commit-Queue: chromium-internal-autoroll <chromium-internal-autoroll@skia-corp.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#839364}

DEPS

@@ -1594,7 +1594,7 @@ deps = {
     'packages': [
       {
         'package': 'chromeos_internal/apps/help_app/app',
-        'version': 'qJhtBw7ouc--Fdht1yXy9-ZDPYguiqAZbixcf8MasiwC',
+        'version': 'nmFhO5_ZTTtPNJGhEylXtJ4sG_lvSsW7CgsI4mn7xzoC',
       },
     ],
     'condition': 'checkout_chromeos and checkout_src_internal',