Revert 230840 "DevTools: Introduce DevToolsTargetImpl to unify d..."

> DevTools: Introduce DevToolsTargetImpl to unify debug target across several places in Chrome
> 
> R=vsevik@chromium.org
> TBR=jochen@chromium.org for chrome.gyp
> BUG=None
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=230720
> 
> Review URL: https://codereview.chromium.org/27217005

it was failing http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%282%29/builds/25740/steps/browser_tests/logs/RemoteDebugger.

TBR=kaznacheev@chromium.org

Review URL: https://codereview.chromium.org/42753002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230876 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230876