Update the gyp Linux build:

media/media.gyp

 # Copyright (c) 2009 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,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 80 matching lines @@
         'audio/win/audio_output_win_unittest.cc',
         'base/data_buffer_unittest.cc',
         'base/pipeline_impl_unittest.cc',
         'base/run_all_unittests.cc',
         'base/video_frame_impl_unittest.cc',
         'base/yuv_convert_unittest.cc',
         'filters/file_data_source_unittest.cc',
         'filters/video_decoder_unittest.cc',
         'filters/video_renderer_unittest.cc',
       ],
+      'conditions': [
+        ['OS=="linux"', {
+          'dependencies': [
+            # Needed for the following #include chain:
+            #   base/run_all_unittests.cc
+            #   ../base/test_suite.h
+            #   gtk/gtk.h
+            '../build/linux/system.gyp:gtk',
+          ],
+        }],
+      ],
     },
   ],
 }