[Ozone] Fix multiple definition of GpuMemoryBufferFactory::Create()

content/content_common.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',
     '../components/tracing.gyp:tracing',
     '../gpu/command_buffer/command_buffer.gyp:gles2_utils',
     '../net/net.gyp:net',
@@ skipping 897 matching lines @@
     ['use_ozone==1', {
       'dependencies': [
         '../ui/ozone/ozone.gyp:ozone',
         '../ui/ozone/gpu/ozone_gpu.gyp:ozone_gpu',
       ],
       'sources': [
         'common/gpu/client/gpu_memory_buffer_impl_ozone.cc',
       ],
       'sources!': [
         'common/gpu/client/gpu_memory_buffer_impl_linux.cc',
+        'common/gpu/gpu_memory_buffer_factory_linux.cc',
       ],
     }],
   ],
 }