Revert of DevTools: more excessive dumping for jump-to-previous-position.html test (https://codereview.chromium.org/290393002/)

Reason for revert:
Looks like test is not accidentally failing any more during last week. Reverting this debugging patch

Original issue's description:
> DevTools: more excessive dumping for jump-to-previous-position.html test
> 
> This patch, as well as r174171, adds even more excessive dumping for
> jump-to-previous-position.html test.
> The changes are expected to be reverted as the reason of failures will
> be detected.
> 
> BUG=361588
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=174282

TBR=vsevik@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=361588

Review URL: https://codereview.chromium.org/302043003

git-svn-id: svn://svn.chromium.org/blink/trunk@175114 bbb929c8-8fbe-4397-9dbb-9b2b20218538