Use a constant instead of int.parse("0x10ffff")
Use a constant instead of int.parse("0x10ffff")

BUG=
R=terry@google.com

Review URL: https://codereview.chromium.org//651513003

git-svn-id: ba870c207403ed87e84e4e2f3f91276ef01d69f6@41431 260f80e4-7a28-3924-810f-c04153c831b5

yjbanov/csslib,dart-lang/csslib,serates/csslib,serates/csslib,dart-lang/csslib,yjbanov/csslib