Hide icons in message center on lock screen

ui/views/layout/grid_layout.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_LAYOUT_GRID_LAYOUT_H_
 #define UI_VIEWS_LAYOUT_GRID_LAYOUT_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 111 matching lines @@
 
   // Adds a padding row. Padding rows typically don't have any views, and
   // but are used to provide vertical white space between views.
   // Size specifies the height of the row.
   void AddPaddingRow(float vertical_resize, int size);
 
   // A convenience for AddPaddingRow followed by StartRow.
   void StartRowWithPadding(float vertical_resize, int column_set_id,
                            float padding_resize, int padding);
 
-  // Starts a new row with the specified column set.
-  void StartRow(float vertical_resize, int column_set_id);
+  // Starts a new row with the specified column set and height (0 for
+  // unspecified height).
+  void StartRow(float vertical_resize, int column_set_id, int height = 0);
 
   // Advances past columns. Use this when the current column should not
   // contain any views.
   void SkipColumns(int col_count);
 
   // Adds a view using the default alignment from the column. The added
   // view has a column and row span of 1.
   // As a convenience this adds the view to the host. The view becomes owned
   // by the host, and NOT this GridLayout.
   void AddView(View* view);
@@ skipping 220 matching lines @@
   // The master column of those columns that are linked. See Column
   // for a description of what the master column is.
   std::vector<Column*> master_columns_;
 
   DISALLOW_COPY_AND_ASSIGN(ColumnSet);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_LAYOUT_GRID_LAYOUT_H_