base: rename Environment::GetEnv to Environment::GetVar.

This is the part 4 and the latest of this series.

BUG=None
TEST=trybots

Review URL: http://codereview.chromium.org/3029062

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55326 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 3ba7e0887015ba6a59579c4de08a6d609f851c23
6 files changed
tree: 9f644a7e6bd18aa0b3bad40bde8e4fd5eeb74cb0
  1. base/
  2. build/
  3. ipc/
  4. testing/