views: Factor out SingleSplitView Observer into SingleSplitViewListener.

views/views.gyp

 # Copyright (c) 2011 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
 
   'target_defaults': {
@@ skipping 189 matching lines @@
         'controls/scrollbar/native_scroll_bar_win.h',
         'controls/scrollbar/native_scroll_bar_wrapper.h',
         'controls/scrollbar/native_scroll_bar.cc',
         'controls/scrollbar/native_scroll_bar.h',
         'controls/scrollbar/scroll_bar.cc',
         'controls/scrollbar/scroll_bar.h',
         'controls/separator.cc',
         'controls/separator.h',
         'controls/single_split_view.cc',
         'controls/single_split_view.h',
+        'controls/single_split_view_listener.h',
         'controls/tabbed_pane/native_tabbed_pane_gtk.cc',
         'controls/tabbed_pane/native_tabbed_pane_gtk.h',
         'controls/tabbed_pane/native_tabbed_pane_win.cc',
         'controls/tabbed_pane/native_tabbed_pane_win.h',
         'controls/tabbed_pane/native_tabbed_pane_wrapper.h',
         'controls/tabbed_pane/tabbed_pane.cc',
         'controls/tabbed_pane/tabbed_pane.h',
         'controls/tabbed_pane/tabbed_pane_listener.h',
         'controls/table/native_table_wrapper.h',
         'controls/table/native_table_gtk.cc',
@@ skipping 731 matching lines @@
               'dependencies': [
                 '../chrome/chrome.gyp:packed_resources',
                ],
             }],
           ],
         },
       ],
     }],
   ],
 }