[isolate] Remove another log entry.
[isolate] Remove another log entry.

After looking at logs, I realized this log entry wasn't useful

R=747cf52e0cef2e3e9371802a2d344b6c87126a4b@chromium.org

Change-Id: Ibfcf3518832757cf2dea1f3a379379b2ff3e04ae
Reviewed-on: https://chromium-review.googlesource.com/c/1370325
Reviewed-by: Quinten Yearsley <747cf52e0cef2e3e9371802a2d344b6c87126a4b@chromium.org>
Commit-Queue: Marc-Antoine Ruel <d2bf0fc09b08f7b0888b3ddab32b3e89c7122c8b@chromium.org>

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py