Revert 230334 "Improve and simplify AudioOutputDispatcher."

Revert 230334 "Improve and simplify AudioOutputDispatcher."

Likely cause of flakiness on Win7 Debug (NVIDIA) bot.

BUG=310838
> Improve and simplify AudioOutputDispatcher.
> 
> AudioOutputDispatcher does a number of things which no longer make
> sense in a world where we don't create tons of physical streams:
> 
>     - Streams are not immediately recycled but instead inserted
>     into a paused queue.  This was done to improve cycle time
>     when physical streams were rapidly paused and played.
> 
>     - If any stream was paused previously and then closed, every
>     new stream opened will open two streams.  Again this was to
>     improve cycle time for paused and played streams.
> 
> For HTML5, this has been handled by AudioRendererMixer for some time.
> WebRTC, WebAudio, and PPAPI generally don't start and stop streams
> repeatedly in a way that this code is beneficial.
> 
> As such, all of that code has been removed.  As a hedge, one stream
> is left open after Close() until the close timer fires.  This allows
> cycle time to be improved in cases of interleaved Start/Stop cycles.
> 
> I've additionally cleaned up the code to use std::algorithm where
> applicable, removed unnecessary WeakPtr setup, and cleaned up the
> unittests.
> 
> BUG=none
> TEST=audio plays, unittests pass.
> 
> Review URL: https://codereview.chromium.org/27605002

TBR=dalecurtis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=230543

[Ken Russell (switch to Gerrit), 2013-10-23 23:05:29]

Committed patchset #1 manually as r230543.