Remove *RowHeightScrollHelper from scroll_view.h/cc

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"
@@ skipping 174 matching lines @@
   // If true, never show the horizontal scrollbar (even if the contents is wider
   // than the viewport).
   bool hide_horizontal_scrollbar_;
 
   // Focus ring, if one is installed.
   View* focus_ring_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(ScrollView);
 };
 
-// VariableRowHeightScrollHelper is intended for views that contain rows of
-// varying height. To use a VariableRowHeightScrollHelper create one supplying
-// a Controller and delegate GetPageScrollIncrement and GetLineScrollIncrement
-// to the helper. VariableRowHeightScrollHelper calls back to the
-// Controller to determine row boundaries.
-class VariableRowHeightScrollHelper {
- public:
-  // The origin and height of a row.
-  struct RowInfo {
-    RowInfo(int origin, int height) : origin(origin), height(height) {}
-
-    // Origin of the row.
-    int origin;
-
-    // Height of the row.
-    int height;
-  };
-
-  // Used to determine row boundaries.
-  class Controller {
-   public:
-    // Returns the origin and size of the row at the specified location.
-    virtual VariableRowHeightScrollHelper::RowInfo GetRowInfo(int y) = 0;
-  };
-
-  // Creates a new VariableRowHeightScrollHelper. Controller is
-  // NOT deleted by this VariableRowHeightScrollHelper.
-  explicit VariableRowHeightScrollHelper(Controller* controller);
-  virtual ~VariableRowHeightScrollHelper();
-
-  // Delegate the View methods of the same name to these. The scroll amount is
-  // determined by querying the Controller for the appropriate row to scroll
-  // to.
-  int GetPageScrollIncrement(ScrollView* scroll_view,
-                             bool is_horizontal, bool is_positive);
-  int GetLineScrollIncrement(ScrollView* scroll_view,
-                             bool is_horizontal, bool is_positive);
-
- protected:
-  // Returns the row information for the row at the specified location. This
-  // calls through to the method of the same name on the controller.
-  virtual RowInfo GetRowInfo(int y);
-
- private:
-  Controller* controller_;
-
-  DISALLOW_COPY_AND_ASSIGN(VariableRowHeightScrollHelper);
-};
-
-// FixedRowHeightScrollHelper is intended for views that contain fixed height
-// height rows. To use a FixedRowHeightScrollHelper delegate
-// GetPageScrollIncrement and GetLineScrollIncrement to it.
-class FixedRowHeightScrollHelper : public VariableRowHeightScrollHelper {
- public:
-  // Creates a FixedRowHeightScrollHelper. top_margin gives the distance from
-  // the top of the view to the first row, and may be 0. row_height gives the
-  // height of each row.
-  FixedRowHeightScrollHelper(int top_margin, int row_height);
-
- protected:
-  // Calculates the bounds of the row from the top margin and row height.
-  RowInfo GetRowInfo(int y) override;
-
- private:
-  int top_margin_;
-  int row_height_;
-
-  DISALLOW_COPY_AND_ASSIGN(FixedRowHeightScrollHelper);
-};
-
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLL_VIEW_H_