Define Panning cursors only on Windows

ui/base/cursor/cursor.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_BASE_CURSOR_CURSOR_H_
 #define UI_BASE_CURSOR_CURSOR_H_
 
 #include "build/build_config.h"
 #include "ui/base/ui_base_export.h"
 
@@ skipping 39 matching lines @@
 const int kCursorSouthResize = 11;
 const int kCursorSouthEastResize = 12;
 const int kCursorSouthWestResize = 13;
 const int kCursorWestResize = 14;
 const int kCursorNorthSouthResize = 15;
 const int kCursorEastWestResize = 16;
 const int kCursorNorthEastSouthWestResize = 17;
 const int kCursorNorthWestSouthEastResize = 18;
 const int kCursorColumnResize = 19;
 const int kCursorRowResize = 20;
+#if defined(OS_WIN)
+// These cursors are for Windows' pan-scrolling.
 const int kCursorMiddlePanning = 21;
 const int kCursorEastPanning = 22;
 const int kCursorNorthPanning = 23;
 const int kCursorNorthEastPanning = 24;
 const int kCursorNorthWestPanning = 25;
 const int kCursorSouthPanning = 26;
 const int kCursorSouthEastPanning = 27;
 const int kCursorSouthWestPanning = 28;
 const int kCursorWestPanning = 29;
+#endif
 const int kCursorMove = 30;
 const int kCursorVerticalText = 31;
 const int kCursorCell = 32;
 const int kCursorContextMenu = 33;
 const int kCursorAlias = 34;
 const int kCursorProgress = 35;
 const int kCursorNoDrop = 36;
 const int kCursorCopy = 37;
 const int kCursorNone = 38;
 const int kCursorNotAllowed = 39;
@@ skipping 60 matching lines @@
 
   PlatformCursor platform_cursor_;
 
   // The device scale factor for the cursor.
   float device_scale_factor_;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_CURSOR_CURSOR_H_