Revert 56978 - Use Environment::GetVar instead of the obscure EnvQueryStr function.
Revert 56978 - Use Environment::GetVar instead of the obscure EnvQueryStr function.

- Remove this obscure function since it was called only once.
- Use Environment::GetVar instead.

BUG=52951
TEST=trybots

Review URL: http://codereview.chromium.org/3135036

TBR=tfarina@chromium.org

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@57013 0039d316-1c4b-4281-b951-d872f2087c98

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