Remove stale function declaration in BrowserPluginGuest.

Remove stale function declaration in BrowserPluginGuest.

The declaration of InAutoSizeBounds is stale since (i) it's not called
anywhere, and (ii) it has no definition. Presumably it's leftover from
whatever CL removed the function and it's caller.

BUG=none

Committed: https://crrev.com/472d6805e25ffc20625dfaea36ea8a1794d9a24e
Cr-Commit-Position: refs/heads/master@{#344230}

[wjmaclean, 2015-08-18 18:27:40]

The CQ bit was checked by wjmaclean@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-18 18:27:50]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1296363003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1296363003/1

[wjmaclean, 2015-08-18 18:28:00]

wjmaclean@chromium.org changed reviewers:
+ paulmeyer@chromium.org

[wjmaclean, 2015-08-18 18:28:24]

One-liner, cleanup - please take a look?

[paulmeyer, 2015-08-18 18:34:16]

On 2015/08/18 18:28:24, wjmaclean wrote:
> One-liner, cleanup - please take a look?

LGTM

[commit-bot: I haz the power, 2015-08-18 21:24:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-18 21:24:27]

Dry run: This issue passed the CQ dry run.

[wjmaclean, 2015-08-19 15:21:33]

The CQ bit was checked by wjmaclean@chromium.org

[commit-bot: I haz the power, 2015-08-19 15:22:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1296363003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1296363003/1

[commit-bot: I haz the power, 2015-08-19 15:27:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-19 15:28:41]

Patchset 1 (id:??) landed as
https://crrev.com/472d6805e25ffc20625dfaea36ea8a1794d9a24e
Cr-Commit-Position: refs/heads/master@{#344230}