cafa097f92
This reverts commit 047c03bf5cc57ab2d4d1025993b1dbc1b83a78a9.
This roll also breaks web tests with:
```
org-dartlang-app:///test/material/icon_button_test.dart:15:7: Warning: Implementing 'Function' is deprecated.
Try removing 'Function' from the 'implements' clause.
class MockOnPressedFunction implements Function {
```
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