Revert "Update V8 to version 8.0.419."

This reverts commit 1823d527.

Reason for revert: Seems to have caused determinism failures

Bug: 1029863

Original change's description:
> Update V8 to version 8.0.419.
> 
> Summary of changes available at:
> https://chromium.googlesource.com/v8/v8/+log/adfb6ba3..684d2057
> 
> Please follow these instructions for assigning/CC'ing issues:
> https://v8.dev/docs/triage-issues
> 
> Please close rolling in case of a roll revert:
> https://v8-roll.appspot.com/
> This only works with a Google account.
> 
> CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux-blink-rel
> CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux_optional_gpu_tests_rel
> CQ_INCLUDE_TRYBOTS=luci.chromium.try:mac_optional_gpu_tests_rel
> CQ_INCLUDE_TRYBOTS=luci.chromium.try:win_optional_gpu_tests_rel
> CQ_INCLUDE_TRYBOTS=luci.chromium.try:android_optional_gpu_tests_rel
> 
> TBR=hablich@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com
> 
> Change-Id: Ia2bb5ff51bfe4d6b2ebc77c171097d374c34df39
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1944383
> Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
> Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/master@{#720481}

TBR=hablich@chromium.org,v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com,v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: I094b8bbd5aa4db4563299c90847a317ef63a106a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Cq-Include-Trybots: luci.chromium.try:linux-blink-rel, luci.chromium.try:linux_optional_gpu_tests_rel, luci.chromium.try:mac_optional_gpu_tests_rel, luci.chromium.try:win_optional_gpu_tests_rel, luci.chromium.try:android_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946452Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720653}

DEPS

@@ -176,7 +176,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.
-  'v8_revision': 'be74b8b6917660e3de1e25875f0a938bedb103cc',
+  'v8_revision': 'adfb6ba32d881a5bba73f9c7121ca9f8dba881b4',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.