Update Sad Tab help text and link.

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 269 matching lines @@
         'ime/mock_input_method.h',
         'ime/text_input_client.h',
         'ime/text_input_type_tracker.h',
         'ime/text_input_type_tracker.cc',
         'layer_helper.cc',
         'layer_helper.h',
         'layer_property_setter.cc',
         'layer_property_setter.h',
         'layout/box_layout.cc',
         'layout/box_layout.h',
+        'layout/center_layout.cc',
+        'layout/center_layout.h',
         'layout/fill_layout.cc',
         'layout/fill_layout.h',
         'layout/grid_layout.cc',
         'layout/grid_layout.h',
         'layout/layout_constants.h',
         'layout/layout_manager.cc',
         'layout/layout_manager.h',
         'metrics.cc',
         'metrics.h',
         'metrics_gtk.cc',
@@ skipping 539 matching lines @@
               'include_dirs': [
                 '<(DEPTH)/third_party/wtl/include',
               ],
             }],
           ],
         },
       ],
     }],      
   ],
 }