Bing Maps API fails to display properly

When forcing a style update, we failed to actually force the update because of
an early-out in updateStyle. This CL teaches that early-out to respect the
Force option, fixing a regression in displaying the Bing Maps API.

R=ojan@chromium.org
BUG=350069

Review URL: https://codereview.chromium.org/195303004

git-svn-id: svn://svn.chromium.org/blink/trunk@168945 bbb929c8-8fbe-4397-9dbb-9b2b20218538