Refactor WindowFinder definition

chrome/browser/ui/views/tabs/window_finder.h

Index: chrome/browser/ui/views/tabs/window_finder.h
diff --git a/chrome/browser/ui/views/tabs/window_finder.h b/chrome/browser/ui/views/tabs/window_finder.h
index 4ce91d50ed01aad9fa9b789755e9e2c4bbda835e..135186e3b27c2ec1aee1cb49b11d76d0f478f20f 100644
--- a/chrome/browser/ui/views/tabs/window_finder.h
+++ b/chrome/browser/ui/views/tabs/window_finder.h
@@ -28,11 +28,15 @@ class WindowFinder {
   // return nullptr if |screen_point| is in another program's window which
   // occludes the topmost chrome window. Ignores the windows in |ignore|, which
   // contain windows such as the tab being dragged right now.
-  virtual gfx::NativeWindow GetLocalProcessWindowAtPoint(
+  gfx::NativeWindow GetLocalProcessWindowAtPoint(
       const gfx::Point& screen_point,
       const std::set<gfx::NativeWindow>& ignore);
 
  private:
+  gfx::NativeWindow GetLocalProcessWindowAtPointImpl(
+      const gfx::Point& screen_point,
+      const std::set<gfx::NativeWindow>& ignore);
+
   DISALLOW_COPY_AND_ASSIGN(WindowFinder);
 };