Revert r1641 (deps mode on by default), it broke compilation on the chromium bots.

See crbug.com/245034

TBR=scottmg
Review URL: https://codereview.chromium.org/15927010/



git-svn-id: http://gyp.googlecode.com/svn/trunk@1642 78cadc50-ecff-11dd-a971-7dbc132099af