split test_registrar target into a new win8_tests.gyp.

split test_registrar target into a new win8_tests.gyp.

r171366 introduced a new 'test_registrar' binary that depends on chrome
into the win8.gyp file; unfortunately, the win8.gyp file is needed by
printing.gyp, which is needed by webkit_support, making the webkit files
now have a circular dependency on chrome, and breaking the webkit.org
win builds, which don't check out chrome/ at all.

This change fixes this temporarily (?) by moving the test binary into
a separate gyp file, but we probably need to do something else to avoid
making ash and win8 depend on chrome.

R=ananta@chromium.org, sky@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=182605

[ananta, 2013-02-14 22:27:18]

lgtm

[sky, 2013-02-14 22:28:47]

LGTM