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Miscellaneous spellfixes. No functional changes.

Mostly instances of "clipboard" and "synchronous", and one of "currently".

Change-Id: Ic313394247301698afee43e6c96bdb5de3f38bac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029458
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Auto-Submit: Darwin Huang <huangdarwin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737019}