Revert 251959 "Refactor the TrayAudio code so that it can be use..."

Revert 251959 "Refactor the TrayAudio code so that it can be use..."

Reverted due to memory leaks:
http://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASAN%20Tests%20%281%29/builds/15922

> Refactor the TrayAudio code so that it can be used by other platforms.
> The motivation here is to introduce the volume slider tray UI into
> Windows Ash.
> 
> This change does not actually add tray audio UI to other platforms,
> only moves some non-chromeos specific things out of the chromeos
> platform folders, so that we can hook in the native Audio APIs
> of other platforms to the tray UI.
> 
> At a high level, this change does the following:
> 
> 1) Move tray_audio out of chromeos/ so that other platforms can
> use the UI that it provides.
> 2) Decouples TrayAudio from CrasAudioHandler by introducing a
> new delegate, in a similar vein to what is done with all the other
> handlers (e.g. the BluetoothHandler)
> 3) Move the additional views (VolumeView, etc) to their own files
> so they can be used by other platforms as well.
> 
> TEST=
>  On CrOS physical device, verified that:
>  1) Keyboard volume buttons function appropriately and display the
>     volume view
>  2) AudioDetailView still is accessible at the correct times
>  3) Adjusting the volume (via the keyboard shortcuts or via the
>     slider) correctly change the output volume.
>  4) UI still behaves correctly (e.g. icons update as the volume
>     changes, mute button works, etc).
> 
> BUG=227247
> 
> Review URL: https://codereview.chromium.org/163953007

TBR=zturner@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=252009

[earthdok, 2014-02-19 08:38:52]

Committed patchset #1 manually as r252009.