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

views/window/window_gtk.cc

Index: views/window/window_gtk.cc
diff --git a/views/window/window_gtk.cc b/views/window/window_gtk.cc
index 7e1e6343b5b7085d2362be82d310e1f9c0c37cfe..06f9d14f75a00c8ff59d562c960c1fb98c0ba620 100644
--- a/views/window/window_gtk.cc
+++ b/views/window/window_gtk.cc
@@ -269,6 +269,14 @@ void WindowGtk::FrameTypeChanged() {
   ThemeChanged();
 }
 
+Window* WindowGtk::AsWindow() {
+  return this;
+}
+
+const Window* WindowGtk::AsWindow() const {
+  return this;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // WindowGtk, WidgetGtk overrides: