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Currently test events use a seperate path for IME because they don't
have an MSG attached to them. This causes discrepancies
between tests and actual functionality. This cl removes the seperate
path and creates an MSG for all events.

This change also revealed that MenuRunnerTest.NonLatinMnemonic was
passing even though the functionality it tests doesn't actually work
on Windows. It sends a WM_CHAR event without sending WM_KEYDOWN event
and a WM_CHAR event alone is not sufficient to select a menu item.

Change-Id: I2be217fe65e9681a60e4405eb0982d838cf8f37d
Reviewed-on: https://chromium-review.googlesource.com/1048246
Commit-Queue: Mustafa Çamurcu <camurcu@google.com>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557940}