Changing an access on os.environ to a get (so things don't complain on mac/linux if DXSDK_DIR is not set).
Changing an access on os.environ to a get (so things don't complain on
mac/linux if DXSDK_DIR is not set).

Review URL: http://codereview.chromium.org/119388

git-svn-id: http://src.chromium.org/svn/trunk/src@18025 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 9aef31a9a7c1f7851eff87a2aca41c934eb364aa
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser