Get rid of stuff like this (that at least showed up in debug builds):
```
Unexpected exception:
TypeError: 604.0795288085938: type 'JSDouble' is not a subtype of type
'int'
StackTrace:
main.dart.js 3527:17 Object.wrapException
main.dart.js 4000:15 Object.intTypeCheck
main.dart.js 55623:39 HtmlElement._varsTop$1
main.dart.js 55631:23 HtmlElement.dart.DebuggerFrameElement._onScroll$1
main.dart.js 3941:14 Object.eval
[...]
```
(Note that I disabled minification in the example above).
Change-Id: Id79e726c3229ba96b1df5db7d4fb779e4be0913a
Reviewed-on: https://dart-review.googlesource.com/74623
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>
Jens Johansen
d560887ae5