Remove .clang-format file for now.

Not all toplevel OWNERS are convinced with this being useful enough yet.
I think we should keep a high bar for new toplevel files. I'm certain
.clang-format will pass that bar eventually, but we should wait with adding it
until all toplevel OWNERS agree with this assessment.

(See comments on https://codereview.chromium.org/23503027/
for background.)

BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/54203005

git-svn-id: svn://svn.chromium.org/blink/trunk@161106 bbb929c8-8fbe-4397-9dbb-9b2b20218538