Remove unneeded JNI registrations.

content/content_app.gypi

 # 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.
 
 {
   'include_dirs': [
     '..',
   ],
   'dependencies': [
     '../base/base.gyp:base',
     '../base/base.gyp:base_i18n',
     '../crypto/crypto.gyp:crypto',
     '../ui/base/ui_base.gyp:ui_base',
     '../ui/gfx/gfx.gyp:gfx',
     '../ui/gfx/gfx.gyp:gfx_geometry',
   ],
   'sources': [
     'app/android/app_jni_registrar.cc',
     'app/android/app_jni_registrar.h',
     'app/android/child_process_service.cc',
     'app/android/child_process_service.h',
     'app/android/content_main.cc',
-    'app/android/content_main.h',
     'app/android/library_loader_hooks.cc',
     'app/content_main.cc',
     'app/content_main_runner.cc',
     'app/mojo/mojo_init.cc',
     'app/mojo/mojo_init.h',
     'app/startup_helper_win.cc',
     'public/app/android_library_loader_hooks.h',
     'public/app/content_main.h',
     'public/app/content_main_delegate.cc',
     'public/app/content_main_delegate.h',
@@ skipping 31 matching lines @@
     }, {
       'dependencies': [
         '../mojo/mojo.gyp:mojo_environment_chromium',
         '../mojo/mojo.gyp:mojo_service_manager',
         '../mojo/mojo.gyp:mojo_system',
         '../mojo/mojo.gyp:mojo_system_impl',
      ],
     }],
   ],
 }