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There is no use of mojo::Binding in Blink. So,
we don't need to keep unnecessary binding.h includes.

Bug: 955171
Change-Id: I1262eb5052f8f5ed468c137cc2c13162b269a463
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1958266Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#723632}