Rename File.readAsText to File.readAsString. There is no Text type in Dart and the methods return Strings.
Rename File.readAsText to File.readAsString. There is no Text type in Dart
and the methods return Strings.

R=sgjesse@google.com
BUG=

Review URL: https://codereview.chromium.org//11412033

git-svn-id: a962b240025cf0577aa172e20f49ccb159ba6be1@15011 260f80e4-7a28-3924-810f-c04153c831b5

maxwellpeterson-wf/pub,cjkao/dart-pub,dart-lang/pub,computmaxer/pub,dart-lang/pub