GitLab

This updates the following systems to use the new improve/regress
format:
  - linux-release
  - linux-release-hardy
  - mac10.5
  - mac10.6
  - vista-release-dual-core
  - vista-release-single-core
  - xp-release-dual-core
  - xp-release-single-core

BUG=none
TEST=perf steps run correctly

Review URL: http://codereview.chromium.org/3148028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@56872 0039d316-1c4b-4281-b951-d872f2087c98