Rename mojo_html_viewer target to just html_viewer.

mojo/mojo_services.gypi

 # Copyright (c) 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.
 
 {
   'targets': [
     {
       # GN version: //mojo/services/clipboard/
       'target_name': 'mojo_clipboard',
       'type': 'loadable_module',
@@ skipping 46 matching lines @@
         'services/public/mojo_services_public.gyp:mojo_gpu_bindings',
         'public/mojo_public.gyp:mojo_cpp_bindings',
       ],
       'export_dependent_settings': [
         'services/public/mojo_services_public.gyp:mojo_gpu_bindings',
         'public/mojo_public.gyp:mojo_cpp_bindings',
       ],
     },
     {
       # GN version: //mojo/services/html_viewer
-      'target_name': 'mojo_html_viewer',
+      'target_name': 'html_viewer',
       'type': 'loadable_module',
       'dependencies': [
         '../cc/blink/cc_blink.gyp:cc_blink',
         '../cc/cc.gyp:cc',
         '../cc/cc.gyp:cc_surfaces',
         '../media/blink/media_blink.gyp:media_blink',
         '../media/media.gyp:media',
         '../net/net.gyp:net',
         '../skia/skia.gyp:skia',
         '../third_party/WebKit/public/blink.gyp:blink',
@@ skipping 610 matching lines @@
               'dependencies': [
                 '../ui/gfx/x/gfx_x11.gyp:gfx_x11',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }