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The boolean looks like it was needed because there was a bug in iOS 4
that didn't allow for this custom copy behavior. Now, the underlying
OnCopy method never returns false, and iOS 4 is no longer supported,
so this doesn't need t return a boolean. The copy will always happen.

Bug: 866446
Change-Id: I11f3b90b191d10442ab513d377756cacbfb898e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869005
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709060}