Reverts "Roll Flutter Engine from 419fb8c0ab3e to b9f9015ff986 (12 revisions) (flutter#154764)" (flutter#154765)

Reverts: flutter#154764
Initiated by: jonahwilliams
Reason for reverting: failing post submit on mac module test.
Original PR Author: engine-flutter-autoroll

Reviewed By: {fluttergithubbot}

This change reverts the following previous change:

flutter/engine@419fb8c...b9f9015

2024-09-07 98614782+auto-submit[bot]@users.noreply.github.com Reverts "[skwasm] use temporary RawPaint objects (flutter#54917)" (flutter/engine#55018)
2024-09-06 [email protected] [engine] reland: always post tasks for platform channel responses. (flutter/engine#55006)
2024-09-06 [email protected] Roll Skia from 4786936b4c0c to 06cd203d0607 (2 revisions) (flutter/engine#55014)
2024-09-06 [email protected] [multiple] Avoid new `unreachable_switch_default` warning. (flutter/engine#54996)
2024-09-06 [email protected] [skwasm] use temporary RawPaint objects (flutter/engine#54917)
2024-09-06 [email protected] [DisplayList] use DlScalar, DlPoint, DlRect exclusively in DlOpReceiver methods (flutter/engine#54982)
2024-09-06 [email protected] Roll Skia from f38ea0134dba to 4786936b4c0c (4 revisions) (flutter/engine#55013)
2024-09-06 [email protected] [Impeller] opt into exp canvas. (flutter/engine#54913)
2024-09-06 [email protected] Roll Skia from 8f62a6a4a299 to f38ea0134dba (4 revisions) (flutter/engine#55008)
2024-09-06 [email protected] [impeller] fake image for fake tests. (flutter/engine#54974)
2024-09-06 [email protected] Roll Skia from 6ad117bd2efe to 8f62a6a4a299 (1 revision) (flutter/engine#55001)
2024-09-06 [email protected] Change "there own" to "their own" in Flutter-GPU docs (flutter/engine#54921)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC [email protected],[email protected],[email protected] on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

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

Author: auto-submit[bot]

bin/internal/engine.version

@@ -1 +1 @@
-b9f9015ff98654454c6bc24588fd0f6b46861e04
+419fb8c0ab3e16429757de2a9174d7e2809b9bdc