Roll Dart to df5036eb6e738c723339ed74c1e8ca93bea2570d. (#16936)

DEPS

@@ -34,7 +34,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '57462f9ca52000932d2ac82613808131650b440c',
+  'dart_revision': 'df5036eb6e738c723339ed74c1e8ca93bea2570d',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

-Signature: 3cc623c46feb1a616e6dc27b9168581f
+Signature: c0d0a2e1f16f13bfd61d0ffb9d142ca7
 
 UNUSED LICENSES:
 

third_party/tonic/dart_persistent_value.cc

@@ -43,8 +43,12 @@ void DartPersistentValue::Clear() {
     return;
   }
 
-  DartIsolateScope scope(dart_state->isolate());
-  Dart_DeletePersistentHandle(value_);
+  if (Dart_CurrentIsolateGroup()) {
+    Dart_DeletePersistentHandle(value_);
+  } else {
+    DartIsolateScope scope(dart_state->isolate());
+    Dart_DeletePersistentHandle(value_);
+  }
   dart_state_.reset();
   value_ = nullptr;
 }

third_party/tonic/dart_wrappable.cc

@@ -64,7 +64,7 @@ void DartWrappable::ClearDartWrapper() {
   TONIC_CHECK(!LogIfError(Dart_SetNativeInstanceField(wrapper, kPeerIndex, 0)));
   TONIC_CHECK(
       !LogIfError(Dart_SetNativeInstanceField(wrapper, kWrapperInfoIndex, 0)));
-  Dart_DeleteWeakPersistentHandle(Dart_CurrentIsolate(), dart_wrapper_);
+  Dart_DeleteWeakPersistentHandle(dart_wrapper_);
   dart_wrapper_ = nullptr;
   this->ReleaseDartWrappableReference();
 }