bluetooth: Add EXPORT macro to BluetoothAdapter::Observer.

bluetooth: Add EXPORT macro to BluetoothAdapter::Observer.

Component build requires EXPORT macro when code from content
utilizes this class, as used in upcoming
https://codereview.chromium.org/1125133005

BUG=489330
Committed: https://crrev.com/ad1b429e966f9f0fcaceb60938c7a00fe36c5cb1
Cr-Commit-Position: refs/heads/master@{#330626}

[ortuno, 2015-05-15 23:16:14]

Patchset #1 (id:1) has been deleted

[ortuno, 2015-05-15 23:17:02]

ortuno@chromium.org changed reviewers:
+ armansito@chromium.org

[ortuno, 2015-05-15 23:17:03]

@armansito: Pretty small change. PTAL

[scheib, 2015-05-16 00:24:10]

scheib@chromium.org changed reviewers:
+ scheib@chromium.org

[scheib, 2015-05-16 00:24:10]

LGTM but fix up description text: e.g. something like:

Component build requires EXPORT macro when code from content utilizes this
class, as used in upcoming https://codereview.chromium.org/1111111111111111.

Add BUG.

[ortuno, 2015-05-18 17:54:42]

On 2015/05/15 at 23:17:03, ortuno wrote:
> @armansito: Pretty small change. PTAL

@armansito: ping?

[ortuno, 2015-05-18 17:56:02]

On 2015/05/16 at 00:24:10, scheib wrote:
> LGTM but fix up description text: e.g. something like:
> 
> Component build requires EXPORT macro when code from content utilizes this
class, as used in upcoming https://codereview.chromium.org/1111111111111111.

Done.

> Add BUG.

Done.

[armansito, 2015-05-19 20:19:07]

lgtm

[ortuno, 2015-05-19 20:19:32]

The CQ bit was checked by ortuno@chromium.org

[commit-bot: I haz the power, 2015-05-19 20:21:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1140813004/20001

[commit-bot: I haz the power, 2015-05-19 22:02:52]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-05-19 22:03:30]

Patchset 1 (id:??) landed as
https://crrev.com/ad1b429e966f9f0fcaceb60938c7a00fe36c5cb1
Cr-Commit-Position: refs/heads/master@{#330626}