Revert "Allow tests to specify a package root."

Revert "Allow tests to specify a package root."
Revert "Add dependencies for bots that doesn't build everything."

This reverts r15066 and r15064.

Committed: https://code.google.com/p/dart/source/detail?r=15068

[ahe, 2012-11-19 10:43:41]

Something is really wrong:

shutil.Error:
[('/mnt/data/b/build/slave/dart2js-linux-release-1-5/build/dart/pkg/args/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib',
'/mnt/data/b/build/slave/dart2js-linux-release-1-5/build/dart/out/ReleaseIA32/dart-sdk.tmp/pkg/args/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib',
"[Errno 40] Too many levels of symbolic links:
'/mnt/data/b/build/slave/dart2js-linux-release-1-5/build/dart/pkg/args/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib/lib'")]

[ahe, 2012-11-19 10:44:45]

TBR

[Mads Ager (google), 2012-11-19 10:49:53]

LGTM, urgh.

[ricow1, 2012-11-19 12:22:08]

LGTM