[goocanvasmm] C++11: Use of range-based for loop.

[Murray Cumming <murrayc src gnome org>]

commit dcb3fd93562a69667a57c8d20a9c03a93541cbce
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Jul 29 14:06:57 2015 +0200

    C++11: Use of range-based for loop.

 examples/demo/window.cc |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/examples/demo/window.cc b/examples/demo/window.cc
index db113f6..348f891 100644
--- a/examples/demo/window.cc
+++ b/examples/demo/window.cc
@@ -28,10 +28,8 @@ DemoWindow::DemoWindow()
 
   auto nb = Gtk::manage(new Gtk::Notebook());
 
-  std::vector< Page* >::iterator iter ;
-  for(iter = _pages.begin(); iter != _pages.end(); iter++)
+  for(const auto& p : _pages)
   {
-    auto p = *iter ;
     nb->append_page(*(p->getWidget()), p->getName());
   }