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

views/window/client_view.h

Index: views/window/client_view.h
diff --git a/views/window/client_view.h b/views/window/client_view.h
index 08ddcd44154f8b2a855e7e0f1327ba766c8a0386..405ec4e7d6b8608c8838583b1cfc1e21252d0c5b 100644
--- a/views/window/client_view.h
+++ b/views/window/client_view.h
@@ -31,13 +31,13 @@ class ClientView : public View {
   virtual ~ClientView() {}
 
   // Manual RTTI ftw.
-  virtual DialogClientView* AsDialogClientView() { return NULL; }
+  virtual DialogClientView* AsDialogClientView();
 
   // Returns true to signal that the Window can be closed. Specialized
   // ClientView subclasses can override this default behavior to allow the
   // close to be blocked until the user corrects mistakes, accepts a warning
   // dialog, etc.
-  virtual bool CanClose() { return true; }
+  virtual bool CanClose();
 
   // Notification that the window is closing.  The default implementation
   // forwards the notification to the delegate.