MacViews: Fix scrolling when clicking on the views::ScrollView scroll track

ui/views/controls/scroll_view.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
 #define UI_VIEWS_CONTROLS_SCROLL_VIEW_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "ui/views/controls/scrollbar/scroll_bar.h"
 
 namespace views {
+namespace test {
+class ScrollViewTestApi;
+}
 
 /////////////////////////////////////////////////////////////////////////////
 //
 // ScrollView class
 //
 // A ScrollView is used to make any View scrollable. The view is added to
 // a viewport which takes care of clipping.
 //
 // In this current implementation both horizontal and vertical scrollbars are
 // added as needed.
@@ skipping 61 matching lines @@
   void OnGestureEvent(ui::GestureEvent* event) override;
   const char* GetClassName() const override;
 
   // ScrollBarController overrides:
   void ScrollToPosition(ScrollBar* source, int position) override;
   int GetScrollIncrement(ScrollBar* source,
                          bool is_page,
                          bool is_positive) override;
 
  private:
-  FRIEND_TEST_ALL_PREFIXES(ScrollViewTest, CornerViewVisibility);
+  friend class test::ScrollViewTestApi;
+
   class Viewport;
 
   // Used internally by SetHeader() and SetContents() to reset the view.  Sets
   // |member| to |new_view|. If |new_view| is non-null it is added to |parent|.
   void SetHeaderOrContents(View* parent, View* new_view, View** member);
 
   // Scrolls the minimum amount necessary to make the specified rectangle
   // visible, in the coordinates of the contents view. The specified rectangle
   // is constrained by the bounds of the contents view. This has no effect if
   // the contents have not been set.
@@ skipping 110 matching lines @@
  private:
   int top_margin_;
   int row_height_;
 
   DISALLOW_COPY_AND_ASSIGN(FixedRowHeightScrollHelper);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLL_VIEW_H_