ShellExtensionWebContentsObserver 12 apps/shell/browser/shell_extension_web_contents_observer.cc ShellExtensionWebContentsObserver::ShellExtensionWebContentsObserver( ShellExtensionWebContentsObserver 16 apps/shell/browser/shell_extension_web_contents_observer.cc ShellExtensionWebContentsObserver::~ShellExtensionWebContentsObserver() {}