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Since the smoothness.__ benchmarks have been merged into
rendering.desktop and rendering.mobile, remove the benchmarks and the
no longer necessary page set json files. For now, add the deleted
benchmarks to NON_TELEMETRY_BENCHMARKS in perf_data_generator.py to
avoid errors related to the sharding map.

For the fetch_benchmark_deps_unittest that used
smoothness.top_25_smooth, change to use system_health.common_desktop
because using rendering.desktop fails the "no static local files"
assertion.

Also, remove tough_ad_cases.py completely because it is no longer used.

Bug: 855063
Change-Id: I9b3c0a46b7704b520f8d44479fcd5385c78eb573
Reviewed-on: https://chromium-review.googlesource.com/1120345Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Amy Qiu <amyqiu@google.com>
Cr-Commit-Position: refs/heads/master@{#571559}