Revert of DevTools: [CodeMirrro] defer autocomplete controller initialization

Revert of DevTools: [CodeMirrro] defer autocomplete controller initialization (patchset #2 id:20001 of https://codereview.chromium.org/670163002/)

Reason for revert:
Breaks autocomplete (only ctrl+space works)

Original issue's description:
> DevTools: [CodeMirrro] defer autocomplete controller initialization
> 
> Autocompletion controller intialization makes almost half of the time
> of SourceFrame initialization.
> 
> In order to render editor as fast as possible, this patch defers
> autocompletion initialization until the first need.
> 
> BUG=425550
> R=vsevik
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184263

TBR=lushnikov@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=425550
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184451

[vsevik, 2014-10-27 14:44:33]

Created Revert of DevTools: [CodeMirrro] defer autocomplete controller
initialization

[commit-bot: I haz the power, 2014-10-27 14:45:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/676393003/1

[commit-bot: I haz the power, 2014-10-27 14:45:48]

Committed patchset #1 (id:1) as 184451