Views Examples: Notify Combobox after updating the model

BUG=
R=sky@chromium.org

Review URL: https://codereview.chromium.org/299203003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272617 0039d316-1c4b-4281-b951-d872f2087c98

ui/views/examples/examples_window.cc

@@ -131,6 +131,7 @@ class ExamplesWindowContents : public WidgetDelegateView,
     instance_ = this;
     combobox_->set_listener(this);
     combobox_model_.SetExamples(examples.Pass());
+    combobox_->ModelChanged();
 
     set_background(Background::CreateStandardPanelBackground());
     GridLayout* layout = new GridLayout(this);