Change new List(n) to return fixed length list. Deprecate List.fixedLength, add List.filled.
Change new List(n) to return fixed length list.
Deprecate List.fixedLength, add List.filled.

Make Iterable.toList and List.from take "growable" argument,
defaulting to false.

Review URL: https://codereview.chromium.org//12328104

git-svn-id: 965eb99b257a0350f91a5ab8607b3dea57271703@19112 260f80e4-7a28-3924-810f-c04153c831b5

ronlobo/args,iansf/args,seaneagan/args,dart-lang/args