Adapt TypeMask tests to new TypeMask interface.

Adapt TypeMask tests to new TypeMask interface.

BUG=
TBR=karlklose@google.com

Committed: https://code.google.com/p/dart/source/detail?r=40021

[herhut, 2014-09-09 10:55:06]

Committed patchset #1 (id:1) manually as 40021 (presubmit successful).

[karlklose, 2014-09-09 10:59:15]

https://codereview.chromium.org/552253002/diff/1/tests/compiler/dart2js/union...
File tests/compiler/dart2js/union_type_test.dart (right):

https://codereview.chromium.org/552253002/diff/1/tests/compiler/dart2js/union...
tests/compiler/dart2js/union_type_test.dart:14: MockCompiler compiler = new
MockCompiler.internal(analyzeOnly: true);
Why this change?

[herhut, 2014-09-09 11:03:58]

https://codereview.chromium.org/552253002/diff/1/tests/compiler/dart2js/union...
File tests/compiler/dart2js/union_type_test.dart (right):

https://codereview.chromium.org/552253002/diff/1/tests/compiler/dart2js/union...
tests/compiler/dart2js/union_type_test.dart:14: MockCompiler compiler = new
MockCompiler.internal(analyzeOnly: true);
On 2014/09/09 10:59:15, karlklose wrote:
> Why this change?

A call to [create] only creates a compiler but does not run anything. Just
manually resolving classes, however, is no longer good enough, as TypeMasks only
deal in live classes. So we need to actually run resolution, which the call to
runCompiler facilitates.

[karlklose, 2014-09-09 12:13:37]

LGTM.