Default to not using --find-copies-harder
Default to not using --find-copies-harder

It's too ridiculously slow on Windows and Mac, and there's very little benefit to finding files that were "copied" from an historical file (as
opposed to one that's in the current patch).

BUG=544889

Review-Url: https://codereview.chromium.org/2488823002

CoherentLabs/depot_tools,CoherentLabs/depot_tools