Refactor PanelLayoutManager to use aura::LayoutManager

ash/test/wm_window_test_api.h

Index: ash/test/wm_window_test_api.h
diff --git a/ash/test/wm_window_test_api.h b/ash/test/wm_window_test_api.h
index 33bd1a18a5f633afd0a0ae225c3fe5b50fd3617f..bf4810712d8eee041642fc50639fe165b3c68b33 100644
--- a/ash/test/wm_window_test_api.h
+++ b/ash/test/wm_window_test_api.h
@@ -27,18 +27,12 @@ class WmWindowTestApi {
     DISALLOW_COPY_AND_ASSIGN(GlobalMinimumSizeLock);
   };
 
-  explicit WmWindowTestApi(WmWindow* window) : window_(window) {}
+  WmWindowTestApi() {}
   ~WmWindowTestApi() {}
 
-  void set_use_empty_minimum_size(bool value) {
-    window_->use_empty_minimum_size_for_testing_ = true;
-  }
-
  private:
   static void SetDefaultUseEmptyMinimumSizeForTesting(bool value);
 
-  WmWindow* window_;
-
   DISALLOW_COPY_AND_ASSIGN(WmWindowTestApi);
 };