Mark plugins/netscape-plugin-setwindow-size.html as flaky on Windows
Mark plugins/netscape-plugin-setwindow-size.html as flaky on Windows

It occasionally outputs a duplicate console log.
BUG=496866
TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/1165053002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@196529 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk