Browser8
Instead of waiting for 10 seconds, wait only till execution is done.

Change-Id: Ifc70ae5e895baa49ab8383c6627c819a7fde80a2
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=499387
Signed-off-by: Lev Ufimtsev <lufimtse@redhat.com>