Chris Bracken a40cc7bb46 Revert "Roll Dart to 4b64a835b9c10480063739d1e73847dcc4d8bfb6. (#4166)" (#4172)
This reverts commit 0d2f0cb64819f7669b6134994a4ba6d7211480fa.

Attempting to roll into the framework causes analysis errors with
mock classes implementing HTTP-related classes previously in dart:io:
[error] Classes can only implement other classes. (packages/flutter_tools/test/base/net_test.dart, line 94, col 41)
[error] Classes can only implement other classes. (packages/flutter_tools/test/base/net_test.dart, line 62, col 33)
[error] Classes can only implement other classes. (packages/flutter_tools/test/base/net_test.dart, line 78, col 40)
[error] Classes can only implement other classes. (packages/flutter_tools/test/src/context.dart, line 249, col 46)

and dartdoc failures:
dartdoc:stdout: [error] Target of URI doesn't exist: 'dart:_http'. at /home/travis/build/flutter/flutter/bin/cache/pkg/sky_engine/lib/io/io.dart, line 206.
2017-10-03 18:35:07 -07:00
..