Fix crash in tracing for chrome.identity.getAuthToken

Fix crash in tracing for chrome.identity.getAuthToken

A trace statement in the IdentityGetAuthTokenFunction constructor was
trying to use the app ID, which is not available until later. Moving
the statement to RunAsync fixes the crash.

BUG=411396
Committed: https://crrev.com/3c02f795c743e9cfbd4986d232836c8ab4f03997
Cr-Commit-Position: refs/heads/master@{#296073}

[Michael Courage, 2014-09-22 21:19:56]

courage@chromium.org changed reviewers:
+ fgorski@chromium.org

[fgorski, 2014-09-22 21:23:13]

lgtm

[Michael Courage, 2014-09-22 21:28:31]

The CQ bit was checked by courage@chromium.org

[commit-bot: I haz the power, 2014-09-22 21:29:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/588343002/1

[commit-bot: I haz the power, 2014-09-22 22:35:13]

Committed patchset #1 (id:1) as ab238cd26f76274976623b44c9cfb5e4ddb86c5f

[commit-bot: I haz the power, 2014-09-22 22:35:44]

Patchset 1 (id:??) landed as
https://crrev.com/3c02f795c743e9cfbd4986d232836c8ab4f03997
Cr-Commit-Position: refs/heads/master@{#296073}