Refactor WindowFinder definition

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

Index: chrome/browser/ui/views/tabs/window_finder.cc
diff --git a/chrome/browser/ui/views/tabs/window_finder.cc b/chrome/browser/ui/views/tabs/window_finder.cc
index 7f95d12d1a6b89961bacfdba9ec57c6dac19b6f3..5bed795131c1f1d2214409810a014cf40a1e88d6 100644
--- a/chrome/browser/ui/views/tabs/window_finder.cc
+++ b/chrome/browser/ui/views/tabs/window_finder.cc
@@ -4,5 +4,19 @@
 
 #include "chrome/browser/ui/views/tabs/window_finder.h"
 
-WindowFinder::WindowFinder() {}
-WindowFinder::~WindowFinder() {}
+#include "chrome/browser/ui/views/tabs/window_finder_mus.h"
+
+gfx::NativeWindow GetLocalProcessWindowAtPointImpl(
+    const gfx::Point& screen_point,
+    const std::set<gfx::NativeWindow>& ignore);
+
+gfx::NativeWindow WindowFinder::GetLocalProcessWindowAtPoint(
+    const gfx::Point& screen_point,
+    const std::set<gfx::NativeWindow>& ignore) {
+
+  gfx::NativeWindow out;
+  if (GetLocalProcessWindowAtPointMus(screen_point, ignore, &out))
+    return out;
+
+  return GetLocalProcessWindowAtPointImpl(screen_point, ignore);
+}