Remove unnecessary members for tricky lazy initialization in AudioContext.

Remove unnecessary members for tricky lazy initialization in AudioContext.

The lazy initialization required the way to check wheather audio thread is finished or not to avoid lazy initialization by creation of other node after context uninitialzation.

A m_audioThreadFinished is not needed anymore since initialization() will be called only once in construct.

BUG=none

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175130

[KhNo, 2014-05-29 15:00:09]

Please review. :)

[Raymond Toy, 2014-05-29 23:29:01]

lgtm.

But can you run a test before committing this?  In AudioNode.h, set
DEBUG_AUDIONODE_REFERNCES to 1, recompile and run a few simple demos. The
console should show audio nodes being created and deleted.  All nodes should
still be deleted, except the destination node and context.

[KhNo, 2014-05-30 08:09:36]

On 2014/05/29 23:29:01, Raymond Toy wrote:
> lgtm.
> 
> But can you run a test before committing this?  In AudioNode.h, set
> DEBUG_AUDIONODE_REFERNCES to 1, recompile and run a few simple demos. The
> console should show audio nodes being created and deleted.  All nodes should
> still be deleted, except the destination node and context.

Sure, I have tested, no regression of leak about reference of node.
Thanks, Raymond.

[KhNo, 2014-05-30 08:09:42]

The CQ bit was checked by keonho07.kim@samsung.com

[commit-bot: I haz the power, 2014-05-30 08:10:05]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/keonho07.kim@samsung.com/304103002/90001

[commit-bot: I haz the power, 2014-05-30 13:19:18]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/9560)

[commit-bot: I haz the power, 2014-05-30 14:05:58]

Change committed as 175130