Revert of Clean up V4L2 codec-related flags and defines

content/content_tests.gypi

 # Copyright (c) 2013 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': {
+    'use_v4lplugin%': 0,
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
       'test/layouttest_support.cc',
       'test/test_media_stream_renderer_factory.cc',
       'test/test_media_stream_renderer_factory.h',
       'test/test_video_frame_provider.cc',
       'test/test_video_frame_provider.h',
     ],
@@ skipping 1586 matching lines @@
                   '../build/linux/system.gyp:x11',  # Used by rendering_helper.cc
                   '../ui/gfx/x/gfx_x11.gyp:gfx_x11',
                 ],
               }],
               ['use_ozone==1 and chromeos==1', {
                 'dependencies': [
                   '../ui/display/display.gyp:display', # Used by rendering_helper.cc
                   '../ui/ozone/ozone.gyp:ozone',       # Used by rendering_helper.cc
                 ],
               }],
+              ['use_v4lplugin==1', {
+                'defines': ['USE_LIBV4L2'],
+              }],
             ],
             # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
             'msvs_disabled_warnings': [ 4267, ],
           },
         ]
     }],
     ['chromeos==1 and target_arch != "arm"', {
       'targets': [
           {
             'target_name': 'vaapi_h264_decoder_unittest',
@@ skipping 473 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }