The function WebPluginListBuilderImpl::addMediaTypeToLastPlugin() in WebKit/chromium/src does not initialize the pluginIndex field of the MimeClassInfo struct. Quick fix coming shortly. (CC-ing last editor according to 'git blame')
Created attachment 57201 [details] patch: initialize pluginIndex field, use .at() instead of [] for indexing mimes
Created attachment 57206 [details] patch - quick fix: fix crashing part only Patch landed unreviewed to fix the crashing issue. TBR=andersca@apple.com