Delete dead code: OmxVideoDecodeAccelerator is unused.

content/content_gpu.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../skia/skia.gyp:skia',
     '../ui/gl/gl.gyp:gl',
   ],
@@ skipping 52 matching lines @@
             'python',
             '../build/extract_from_cab.py',
             '..\\third_party\\directxsdk\\files\\Redist\\<(input)',
             '<(output)',
             '<(PRODUCT_DIR)',
           ],
           'msvs_cygwin_shell': 1,
         },
       ],
     }],
-    ['target_arch=="arm" and chromeos == 1', {
-      'include_dirs': [
-        '<(DEPTH)/third_party/openmax/il',
-      ],
-    }],
     ['target_arch!="arm" and chromeos == 1', {
       'include_dirs': [
         '<(DEPTH)/third_party/libva',
       ],
     }],
   ],
 }