Initializing m_platformLayer in PluginView has been removed in https://bugs.webkit.org/show_bug.cgi?id=78598 But there are still codes related to m_platformLayer. This code path is not used anymore.
Created attachment 194798 [details] Patch
Comment on attachment 194798 [details] Patch Clearing flags on attachment: 194798 Committed r154385: <http://trac.webkit.org/changeset/154385>
All reviewed patches have been landed. Closing bug.