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Move several perf_tests from dom to Editing

See bug 902661 for the context. Several tests in perf_test/DOM should be in
perf_tests/Editing.

Bug: 902661
Change-Id: I9e668181f4642f989c62bf2511af6ca71dd523fe
Reviewed-on: https://chromium-review.googlesource.com/c/1325271Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606724}