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- GetNewTabButtonIdealX seems not used.

Change-Id: I01f27b70dcfd23b76ba1b3b70c083576143cf8f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494441
Commit-Queue: Connie Wan <connily@chromium.org>
Reviewed-by: Connie Wan <connily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820931}