events: keycodes: Add missing exports to keyboard_code_conversion_xkb.h

events: keycodes: Add missing exports to keyboard_code_conversion_xkb.h

This fixes the component=shared_library build on Chrome OS.

BUG=none
TEST=cros chrome-sdk --board=link
  GYP_DEFINES="$GYP_DEFINES component=shared_library" gclient runhooks
  ninja -C out_link/Release chrome chrome_sandbox

Committed: https://crrev.com/85ceb71724b3c44753546c5dae032faa7b3a3126
Cr-Commit-Position: refs/heads/master@{#329354}

[spang, 2015-05-11 20:25:14]

spang@chromium.org changed reviewers:
+ kpschoedel@chromium.org, sadrul@chromium.org, wez@chromium.org

[kpschoedel, 2015-05-12 00:20:18]

lgtm

[Wez, 2015-05-12 02:02:43]

lgtm

[spang, 2015-05-12 04:17:59]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-05-12 04:18:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1136123004/1

[commit-bot: I haz the power, 2015-05-12 04:59:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-12 05:01:03]

Patchset 1 (id:??) landed as
https://crrev.com/85ceb71724b3c44753546c5dae032faa7b3a3126
Cr-Commit-Position: refs/heads/master@{#329354}