Implement ChromeVox next/previous line, link, and heading.

chrome/browser/resources/chromeos/chromevox/chromevox.gyp

 # Copyright 2014 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.
 
 {
   'conditions': [
     ['chromeos==1', {
       'variables': {
         # Whether to compress the 4 main ChromeVox scripts.  Applicable if
         # use_migrated_chromevox is true.
@@ skipping 173 matching lines @@
                 'cvox2/background/background.html',
               ],
             },
           ],
         },
         {
           'target_name': 'chromevox2_manifest',
           'type': 'none',
           'variables': {
             'output_manifest_path': '<(chromevox_dest_dir)/manifest_next.json',
-'use_chromevox_next': 1,
+            'use_chromevox_next': 1,
           },
           'includes': [ 'generate_manifest.gypi', ],
         },
         {
           'target_name': 'chromevox2_guest_manifest',
           'type': 'none',
           'variables': {
             'output_manifest_path': '<(chromevox_dest_dir)/manifest_next_guest.json',
             'is_guest_manifest': 1,
             'use_chromevox_next': 1,
@@ skipping 58 matching lines @@
                 '<(options_script_loader_file)',
               ],
               'includes': [ 'copy_js.gypi', ],
             },
           ],
         }],
       ],
     }],
   ],
 }