Fix analyzer error in pub's generated source.

Fix analyzer error in pub's generated source.

BUG=https://github.com/dart-lang/async_await/issues/68
R=ricow@google.com

Committed: https://code.google.com/p/dart/source/detail?r=41126

[Bill Hesse, 2014-10-15 12:02:44]

whesse@google.com changed reviewers:
+ nweiz@google.com, ricow@google.com

[Bill Hesse, 2014-10-15 12:02:45]

Identical to the change in https://codereview.chromium.org//655943002

, applied in a second location.

[Bill Hesse, 2014-10-15 12:04:16]

On 2014/10/15 12:02:45, Bill Hesse wrote:
> Identical to the change in https://codereview.chromium.org//655943002
> 
> , applied in a second location.

This works around the issue https://github.com/dart-lang/async_await/issues/68,
but the issue is already solved, and could also be applied by updating the
checkout of async-await in dart/third_party/pkg/async-await.

[ricow1, 2014-10-15 12:16:33]

lgtm

[Bill Hesse, 2014-10-15 12:47:45]

Committed patchset #1 (id:1) manually as 41126 (presubmit successful).

[Bill Hesse, 2014-10-15 13:05:29]

On 2014/10/15 12:04:16, Bill Hesse wrote:
> On 2014/10/15 12:02:45, Bill Hesse wrote:
> > Identical to the change in https://codereview.chromium.org//655943002
> > 
> > , applied in a second location.
> 
> This works around the issue
https://github.com/dart-lang/async_await/issues/68,
> but the issue is already solved, and could also be applied by updating the
> checkout of async-await in dart/third_party/pkg/async-await.

Oops - the issue is not fixed in tip-of-tree async-await.