Timeline: followup fix for r164289. Replace WebInspector.Panel.* calls with WebInspector.View.*

BUG=
R=caseq@chromium.org

Review URL: https://codereview.chromium.org/112943004

git-svn-id: svn://svn.chromium.org/blink/trunk@164315 bbb929c8-8fbe-4397-9dbb-9b2b20218538