Roll Help App from v84Xu6J9U... to 50LmdZ87A...

Release_Notes:http://go/help_app-x20/relnotes/Nightly/help_app_nightly_202008180800_RC00.html

https://chrome-infra-packages.appspot.com/p/chromeos_internal/apps/help_app/app/+/50LmdZ87Aei15bQBU0QVN59IeJPvU-acRxSAEOTzcrYC

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: b/163948970
Tbr: help-app@grotations.appspotmail.com
Change-Id: I8c005ecbf906685b044a9a4d8d3e9dd5292e2c50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363060Reviewed-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@{#799153}

DEPS

@@ -1550,7 +1550,7 @@ deps = {
     'packages': [
       {
         'package': 'chromeos_internal/apps/help_app/app',
-        'version': 'v84Xu6J9UdiZkQPrVZVu5ECq1RWmFqIUZgaH-BecwToC',
+        'version': '50LmdZ87Aei15bQBU0QVN59IeJPvU-acRxSAEOTzcrYC',
       },
     ],
     'condition': 'checkout_chromeos and checkout_src_internal',