ninja: Enable deps mode on non-windows.
ninja: Enable deps mode on non-windows.

We landed ninja 1.3.4, which should have fixed crbug.com/245034. Trying this
again.

BUG=chromium:245034
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/15713018
witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp