ozone: evdev: Remove native size member from TouchEventConverterEvdev

ozone: evdev: Remove native size member from TouchEventConverterEvdev

This used to store the original size prior to calibration but that
changed in r304472 ("Keep track of window -> displays mapping"). It no
longer behaves as documented & isn't necessary, so remove it.

TEST=compile
BUG=none

Committed: https://crrev.com/1bc572e4e5f3b74b03061d50ec032b5ad1fa71cb
Cr-Commit-Position: refs/heads/master@{#322046}

[spang, 2015-03-24 18:42:21]

spang@chromium.org changed reviewers:
+ dnicoara@chromium.org

[dnicoara, 2015-03-24 18:54:35]

lgtm

[spang, 2015-03-24 18:55:19]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-03-24 18:56:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1035513002/1

[commit-bot: I haz the power, 2015-03-24 19:29:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-24 19:30:48]

Patchset 1 (id:??) landed as
https://crrev.com/1bc572e4e5f3b74b03061d50ec032b5ad1fa71cb
Cr-Commit-Position: refs/heads/master@{#322046}