Added GlobalCEFApp.DisablePDFExtension property

- Bug fix #89
- New SimpleLazOSRBrowser demo

demos/MDIBrowser/uMainForm.pas

@@ -90,7 +90,7 @@ type
 var
   MainForm: TMainForm;
 
-procedure GlobalCEFApp_OnContextInitialized;
+procedure CreateGlobalCEFApp;
 
 implementation
 
@@ -110,6 +110,12 @@ begin
     PostMessage(MainForm.Handle, CEFBROWSER_INITIALIZED, 0, 0);
 end;
 
+procedure CreateGlobalCEFApp;
+begin
+  GlobalCEFApp                      := TCefApplication.Create;
+  GlobalCEFApp.OnContextInitialized := GlobalCEFApp_OnContextInitialized;
+end;
+
 procedure TMainForm.CreateMDIChild(const Name: string);
 var
   TempChild : TChildForm;