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The Chinese Pinyin IME on Mac uses arrow keys to select candidate words.
Because -[NSView interpretKeyEvents:] silently consumes the arrow key
without notifying NSTextInputClient, currently MacViews textfield will
handle arrow keys as accelerators and dismiss the IME even in the
presence of composition text.

This CL fixes this bug by omitting arrow keys as accelerators when the
composition text exists. This bug has the same root cause as seen in
crbug/883952

Bug: 915924
Change-Id: I408fbb637e635c2e048a83dfbc1847820019827e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464078
Commit-Queue: Keren Zhu <kerenzhu@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816073}