Temporary workaround for bug 22732.
Temporary workaround for bug 22732.

Analyzer is failing to implement type promotion properly, causing it
to incorrectly flag "current.thenBlock" and "current.elseBlock" with a
warning.

As a temporary workaround, declare a variable with the correct type.

TBR=sra@google.com

Review URL: https://codereview.chromium.org//987133002

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@44333 260f80e4-7a28-3924-810f-c04153c831b5

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