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In this CL, let TSFTextStore::CancelComposition() clean up the composition related member variables and terminate the composition directly.
TextInputClient could clear current composition range before requesting the cancel composition, so
|string_pending_insertion_| could be cleared in ResetCacheAfterEditSession().
That breaks to terminate the composition in ConfirmComposition().

Bug: 1156985
Change-Id: I40dc8c23aa0f110d7042f63bfad017ed902e9f35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580971Reviewed-by: Anupam Snigdha <snianu@microsoft.com>
Reviewed-by: Siye Liu <siliu@microsoft.com>
Reviewed-by: Yohei Yukawa <yukawa@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: jongdeok.kim <jongdeok.kim@navercorp.com>
Cr-Commit-Position: refs/heads/master@{#835893}