Revert "Roll Dart SDK from 78174b41ab0f to 7a5e410f982e (1 revision) (#51980)" (#51990)

This reverts commit 6dc91bf.

Reverting for flutter/flutter#146506

Author: zanderso

DEPS

@@ -62,7 +62,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '7a5e410f982e25dc52e0bd05411a982f153a67a4',
+  'dart_revision': '78174b41ab0f4bbcb044c07d33bc4e4a409cb83c',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -496,7 +496,7 @@ deps = {
    Var('dart_git') + '/term_glyph.git@2ad48ce95b6e6d001251d55b15719ee113caf802',
 
   'src/flutter/third_party/dart/third_party/pkg/test':
-   Var('dart_git') + '/test.git@2b1ed13ea25c0dfcf112af676533e1daf906a3f0',
+   Var('dart_git') + '/test.git@ce3c8cac1d8e7f055d5443993ac6c0204da17a45',
 
   'src/flutter/third_party/dart/third_party/pkg/test_reflective_loader':
    Var('dart_git') + '/test_reflective_loader.git@d7167a2375d8a0c02c12b960c059a115a777f238',

ci/licenses_golden/licenses_dart

@@ -1,4 +1,4 @@
-Signature: c30fe16a3fe46a74c58f417b5cbef88c
+Signature: f3523db476ddb47dc85e4eaf128d351f
 
 ====================================================================================================
 LIBRARY: dart
@@ -4737,7 +4737,7 @@ Exhibit B - "Incompatible With Secondary Licenses" Notice
   This Source Code Form is "Incompatible With Secondary Licenses", as
   defined by the Mozilla Public License, v. 2.0.
 
-You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/db99af14c4bc5b17cdc2d4dd8ba0a2d14af980dd
+You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/78174b41ab0f4bbcb044c07d33bc4e4a409cb83c
 /third_party/fallback_root_certificates/
 
 ====================================================================================================

sky/packages/sky_engine/LICENSE

@@ -32032,7 +32032,7 @@ Exhibit B - "Incompatible With Secondary Licenses" Notice
   This Source Code Form is "Incompatible With Secondary Licenses", as
   defined by the Mozilla Public License, v. 2.0.
 
-You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/7a5e410f982e25dc52e0bd05411a982f153a67a4
+You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/28b5735ad7dce6585419d26fe147dc406097b93c
 /third_party/fallback_root_certificates/
 
 --------------------------------------------------------------------------------