Add unit test for VirtualMemory::Commit.

Better late than never.

R=iposva@google.com

Review URL: https://codereview.chromium.org//684783010

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41539 260f80e4-7a28-3924-810f-c04153c831b5
Remove/skip invalid mirror tests.

-class of 1 is not required to declare int as an interface
-owner of members of mixin applications is the mixin
-MirrorsUsed does not have a semantics

R=gbracha@google.com

Review URL: https://codereview.chromium.org//706793002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41540 260f80e4-7a28-3924-810f-c04153c831b5
Fix dart2js tests in pub.

Pub's [requestShouldSucceed] test helper didn't verify that the
request returned a 200 response, which was masking some issues.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//704053002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41541 260f80e4-7a28-3924-810f-c04153c831b5