FileSystem not supported in FireFox
FileSystem not supported in FireFox

TBR=vsm@google.com

Change-Id: I4e3008021fa3bcf2407a5b433e138d5728ee3107
Reviewed-on: https://dart-review.googlesource.com/29140
Reviewed-by: Terry Lucas <fb7922595ad9c210c0f3ce773f00cc8b9d8e21f3@google.com>
Commit-Queue: Terry Lucas <fb7922595ad9c210c0f3ce773f00cc8b9d8e21f3@google.com>

dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk