mac: Delete cocoa version of FindBarPlatformHelperMacTest.

Like the uitest change in https://chromium-review.googlesource.com/c/chromium/src/+/1237454

For some reason the CQ didn't catch this issue.

TBR=rsesek

Bug: 832676
Change-Id: Ie58e701f0f7d231432c1636366545ee211c5e712
Reviewed-on: https://chromium-review.googlesource.com/1239761
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593450}
1 file changed