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Remove x86 Chrome on ARM Mac perf tests (no longer relevant)
Change sharding to 7 to take advantage of https://chromium-review.googlesource.com/c/chromium/src/+/2548360

Bug: chromium:1138953
Change-Id: I626d9c43a02290afdd592e58c11c9bba1cc6054a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2548360Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Ryan Heise <heiserya@google.com>
Auto-Submit: Ryan Heise <heiserya@google.com>
Cr-Commit-Position: refs/heads/master@{#829895}