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variables ($CC, $DISTCC_DIR, $HOME, etc.).
Accomodate spelling change ($CHROME_SRC_DIR => $SRC_DIR) that
makes the gyp SCons a little more generic.
Use the new $LIB_DIR variable the gyp SCons generator now defines for us.
Review URL: http://codereview.chromium.org/42650

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12583 0039d316-1c4b-4281-b951-d872f2087c98