Ben Konyi 15a34767e9 Update GetCallbackHandle to use Dart_IsTearOff instead of a string comparison (flutter/engine#7324)
* Update GetCallbackHandle to use Dart_IsTearOff instead of a string
comparison to determine whether or not a closure was provided as an
argument to PluginUtilities.GetCallbackHandle.

Fixes #24394
2019-01-04 14:41:56 -08:00
..