Revert 178848 "[DevTools] Make toolbar counters declarative."

This CL or r178850 broke the following browser tests.                                                               
http://build.chromium.org/p/chromium.webkit/builders/Linux%20Tests%20%28dbg%29/builds/3288                          
                                                                                                                    
Let me revert the two CLs at the moment.


> [DevTools] Make toolbar counters declarative.
> 
> This includes error-warning and devices counters.
> 
> BUG=none
> 
> Review URL: https://codereview.chromium.org/408853002

TBR=dgozman@chromium.org

Review URL: https://codereview.chromium.org/416983006

git-svn-id: svn://svn.chromium.org/blink/trunk@178911 bbb929c8-8fbe-4397-9dbb-9b2b20218538