DevTools: Fix obsolete section.rule in StylesSidebarPane
DevTools: Fix obsolete section.rule in StylesSidebarPane

This patch fixes a bug in StyleSideBar sections that didn't update section().rule property.

R=apavlov@chromium.org

Review URL: https://codereview.chromium.org/152643004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@166312 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs