Update mac clang-format download to use platform specific binaries
Update mac clang-format download to use platform specific binaries

Necessary due to https://chromium.googlesource.com/chromium/src/buildtools/+/e1471b21ee9c6765ee95e9db0c76fe997ccad35c%5E%21/
Patterned after https://chromium-review.googlesource.com/c/chromium/src/+/3533408/2/DEPS

Bug: None
Change-Id: I11ade2019dd54481692b8ad5cee0ab0e93c519b8
No-Presubmit: True
No-Tree-Checks: True
No-Try: True
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3542250
Reviewed-by: Kateryna Prokopenko <04b7d4bdbd93555cee90f085bb91b72524d21fca@chromium.org>
Reviewed-by: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>
Commit-Queue: Eric Leese <b4befed3d60c01ea229cdb14329781bec1b07e7f@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend