Use a clang-format.exe binary that statically links the msvc runtime.

New version info same as before: clang-format version 3.5 (198831)
(I've also updated the UpdatingClangFormatBinaries wiki to reflect
build instructions that use /MT).

Add OWNERS file for third_party/clang_format.

TEST="depends.exe clang-format.exe" shows only DBGHELP.DLL KERNEL32.DLL ADVAPI32.DLL
BUG=334416,240309
R=thakis@chromium.org
TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/135853007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244814 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244814