Update clang-format binaries and scripts for all platforms.

I followed these instructions:
https://chromium.googlesource.com/chromium/src/+/master/docs/updating_clang_format_binaries.md

The binaries were built at clang revision 346566 on November 15, 2018.

Rolling because 344070 introduces Java import reordering in
clang-format, and 346566 fixes a critical bug with Objective C.

OLD: https://chromium-review.googlesource.com/c/chromium/src/+/1296816
NEW: https://chromium-review.googlesource.com/c/chromium/src/+/1331609

ls -l output
-rwxr-xr-x 1 smaier primarygroup 1967524 Nov 15 16:47 buildtools/mac/clang-format
-rwxr-xr-x 1 smaier primarygroup 1862936 Nov 15 14:06 buildtools/linux64/clang-format
-rw-r--r-- 1 smaier primarygroup 2637824 Nov 15 14:04 buildtools/win/clang-format.exe


Bug: 768586,768983
Change-Id: I2761fc91201d2ffa0d999e637f8f8ba53bcccb5e
6 files changed