Added attributes for stating if a docshell should allow plugins or not.

docshell/base/nsIDocShell.idl

@@ -125,6 +125,11 @@ interface nsIDocShell : nsISupports
 	*/
 	attribute nsIURIContentListener parentURIContentListener;
 
+	/*
+	Attribute stating if it should allow plugins or not.
+	*/
+	attribute boolean allowPlugins;
+
 	/**
 	* Set/Get the document scale factor.  When setting this attribute, a
 	* NS_ERROR_NOT_IMPLEMENTED error may be returned by implementations