Do all OOLing in the views code. linux_views now builds clean with the clang plugin.

views/window/window_gtk.h

Index: views/window/window_gtk.h
diff --git a/views/window/window_gtk.h b/views/window/window_gtk.h
index 9f1af0d8129e5735bfb5940a0c4c9a9fe434284d..db154e8f0d1b5fa8a6775756f95135635d627258 100644
--- a/views/window/window_gtk.h
+++ b/views/window/window_gtk.h
@@ -60,8 +60,8 @@ class WindowGtk : public WidgetGtk, public Window {
   virtual bool ShouldUseNativeFrame() const;
   virtual void FrameTypeChanged();
 
-  virtual Window* AsWindow() { return this; }
-  virtual const Window* AsWindow() const { return this; }
+  virtual Window* AsWindow();
+  virtual const Window* AsWindow() const;
 
   // Overridden from WidgetGtk:
   virtual gboolean OnButtonPress(GtkWidget* widget, GdkEventButton* event);