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TSF on Windows has an assumption that |pcchPlainRet| to be 0 if focused
edit control has no text(empty). Failure to satisfy the assumption may
cause hung (dead looped) in the application when using some legacy IMEs.
Therefore, we should set |pcchPlainRet| to 0 if there is no text in
focused edit control (|pcchPlainRet| is 0).

Bug: 981667
Change-Id: I0e851e9c82e7716c5434cfd8ca93eb1a091d0b79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1694408
Commit-Queue: Siye Liu <siliu@microsoft.com>
Reviewed-by: Yohei Yukawa <yukawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676183}