Revert to earlier version of DevTools

This is before the two commits that keep getting rebuilt, but still includes flutter/devtools#9718 which needed to land in g3 for flutter/flutter#181345.

Change-Id: I7b6ffe670b268247bc3753d44cb6d027a1b277bf
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/490741
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Commit-Queue: Elliott Brooks <elliottbrooks@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>

Author: elliette

DEPS

@@ -105,7 +105,7 @@ vars = {
   "boringssl_rev": "4d969991f61733b4cab1ae871b136fd4dd6c6005",
   "browser-compat-data_tag": "ac8cae697014da1ff7124fba33b0b4245cc6cd1b", # v1.0.22
   "cpu_features_rev": "936b9ab5515dead115606559502e3864958f7f6e",
-  "devtools_rev": "be1d7ba3dddc84a6c6b0d4dca9ab62b8b3b24d29",
+  "devtools_rev": "d99fca28d369314ce351ea1ea7daef62ba72c1a9",
   # Use the SHA found in `flutter-candidate.txt` in the devtools repo.
   "flutter_rev": "36ea2bdeab611e908967b6fa57659998f600a2cb",
   "icu_rev": "a86a32e67b8d1384b33f8fa48c83a6079b86f8cd",