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We need to reject out-of-bound ranges. Currently setting range that is
outside the bounds of the text buffer in views::Textfield crashes, as
Textfield uses RenderText to store the text buffer and RenderText will
crash if the range is outside of the cached text buffer.

Hence, we change views::Textfield::SetCompositionFromExistingText to
clear the composition when the provided range is out-of-bound.

Bug: 966484
Change-Id: I770457a1290ca4466b21779264e967789cbb80f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1754498
Commit-Queue: Siye Liu <siliu@microsoft.com>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688216}