Fix test.dart problem when matching client status files when run from a subdirectory.
Fix test.dart problem when matching client status files when run from a subdirectory.

BUG=dart:1040
TEST=cd frog; ../tools/test.dart -cfrogium client; ../tools/build.py; ../tools/test.dart -cfrogium client

Review URL: http://codereview.chromium.org//9111010

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@2990 260f80e4-7a28-3924-810f-c04153c831b5

dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk