Roll Chromium Variations from 967a7c7071dd to 78b6144247d4 (6 revisions)

https://chromium.googlesource.com/chromium-variations.git/+log/967a7c7071dd..78b6144247d4

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/chromium-variations-chromium
Please CC chrome-metrics-team@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Chromium Variations: https://bugs.chromium.org/p/chromium/issues/entry
To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

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

Bug: None
Tbr: chrome-metrics-team@google.com
Change-Id: I0ececf5217f15d9d6f8ad1299ca49ae5196123cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4987249
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1216592}

DEPS

@@ -392,7 +392,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling chromium_variations
   # and whatever else without interference from each other.
-  'chromium_variations_revision': '967a7c7071dd38efaf0e898b72fdc101f988342d',
+  'chromium_variations_revision': '78b6144247d4f11aef6bd83ce4f88d5d6f4be699',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling CrossBench
   # and whatever else without interference from each other.