mojo: Fix double character inserts on Windows by removing a Linux hack.

mojo: Fix double character inserts on Windows by removing a Linux hack.

If we're going to make mojo a write-once-run-anywhere platform, we'll
have to smooth over platform differences in event handling. Currently,
we have code that tries to emulate this behaviour at different levels
of the chrome stack on Linux. This emulation code lead to the double
character insertion bug on Windows: things looked fine on Linux
because we had another hack to cover up the lack of character events,
which just caused double character insertion on Windows.

In this patch, we declare the Windows style of events (a keydown,
a translated character event, a keyup) as canonical and what
should be targeted going forward.

BUG=403514
Committed: https://crrev.com/ff091da898d1079cb8aca10d3016f6bc2471fc89
Cr-Commit-Position: refs/heads/master@{#292222}

[Elliot Glaysher, 2014-08-27 19:23:02]

erg@chromium.org changed reviewers:
+ sky@chromium.org

[sky, 2014-08-27 20:31:23]

LGTM

[Elliot Glaysher, 2014-08-27 20:36:22]

The CQ bit was checked by erg@chromium.org

[commit-bot: I haz the power, 2014-08-27 20:37:58]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/erg@chromium.org/476283006/40002

[commit-bot: I haz the power, 2014-08-27 21:15:31]

Committed patchset #5 (id:40002) as 9a8466c2da88c77bba5f1a0629e39971d39cd033

[commit-bot: I haz the power, 2014-09-10 02:54:00]

Patchset 5 (id:??) landed as
https://crrev.com/ff091da898d1079cb8aca10d3016f6bc2471fc89
Cr-Commit-Position: refs/heads/master@{#292222}