Revert of Make profiling lock global rather than per Target (patchset #2 of https://codereview.chromium.org/475803002/)

Reason for revert:
'common' should not be aware of profiler.

Original issue's description:
> Make profiling lock global rather than per Target
> 
> We should pause any actions that could affect performance if any of the targets is being profiled, not only current target.
> 
> BUG=403684
> R=sergeyv@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180336

TBR=sergeyv@chromium.org,apavlov@chromium.org,yurys@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=403684

Review URL: https://codereview.chromium.org/471393002

git-svn-id: svn://svn.chromium.org/blink/trunk@180342 bbb929c8-8fbe-4397-9dbb-9b2b20218538