Address EventRewriter Warning

Address EventRewriter Warning

The change https://codereview.chromium.org/653423004 introduced a warning. The Simple Chrome workflow treats all ChromeOS warnings as errors (https://sites.google.com/a/chromium.org/dev/chromium-os/how-tos-and-troubleshooting/building-chromium-browser?pli=1)

This change initializes the variable to a default unknown value.

BUG=424596
TEST=Compiled with Simple Chrome workflow. Ran existing EventRewriterTest

Committed: https://crrev.com/d3ba46bfe646262a08822ae2456e38080a7023f5
Cr-Commit-Position: refs/heads/master@{#301117}

[jonross, 2014-10-24 14:55:09]

jonross@chromium.org changed reviewers:
+ zelidrag@chromium.org

[jonross, 2014-10-24 14:55:09]

Hi Zelidrag,

I have created a follow up review to your changes to EventRewriter. A warning
that was introduced blocks compiling ChromeOS locally to deploy.

Could you provide an owners review?

Thanks,
Jon

[zel, 2014-10-24 15:26:59]

lgtm

[zel, 2014-10-24 15:27:03]

The CQ bit was checked by zelidrag@chromium.org

[commit-bot: I haz the power, 2014-10-24 15:29:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/677093002/1

[commit-bot: I haz the power, 2014-10-24 16:14:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-24 16:15:27]

Patchset 1 (id:??) landed as
https://crrev.com/d3ba46bfe646262a08822ae2456e38080a7023f5
Cr-Commit-Position: refs/heads/master@{#301117}