Remove legacy draggable region code and refactor to share common draggable region code

chrome/browser/ui/extensions/shell_window.h

Index: chrome/browser/ui/extensions/shell_window.h
diff --git a/chrome/browser/ui/extensions/shell_window.h b/chrome/browser/ui/extensions/shell_window.h
index 88bcfe11613fd6094d7ffa3e9b282241f467c45f..190ad60a04da26c05db77fa7c9289b67858b9053 100644
--- a/chrome/browser/ui/extensions/shell_window.h
+++ b/chrome/browser/ui/extensions/shell_window.h
@@ -73,6 +73,11 @@ class ShellWindow : public content::NotificationObserver,
                              const GURL& url,
                              const CreateParams& params);
 
+  // Convert draggable regions in raw format to SkRegion format. Caller is
+  // responsible for deleting the returned SkRegion instance.
+  static SkRegion* RawDraggableRegionsToSkRegion(
+      const std::vector<extensions::DraggableRegion>& regions);
+
   const std::string& window_key() const { return window_key_; }
   const SessionID& session_id() const { return session_id_; }
   const extensions::Extension* extension() const { return extension_; }