Revert 223528 "Initial WebUI for DOM Distiller."

Revert 223528 "Initial WebUI for DOM Distiller."

> Initial WebUI for DOM Distiller.
> 
> The DOM Distiller component will contain code for an experimental
> prototype for distilling the core part of a web page.
> 
> To enable this feature, use the command line flag --enable-distiller.
> 
> The webui/ folder depends on content, but given iOS at the time being
> supports the usage of WebUI, it is kept a a top level folder in the
> component instead of in content/.
> 
> BUG=288015
> 
> Review URL: https://chromiumcodereview.appspot.com/23503042

TBR=nyquist@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=223540

[Bei Zhang, 2013-09-17 05:00:03]

Committed patchset #1 manually as r223540.