Make mojo_system static and mojo_system_impl a component, never use both

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 494 matching lines @@
         '../cc/cc.gyp:cc',
         '../gpu/gpu.gyp:command_buffer_service',
         '../gpu/gpu.gyp:gles2_c_lib',
         '../gpu/gpu.gyp:gles2_implementation',
         '../gpu/gpu.gyp:gpu_ipc',
         '../gpu/skia_bindings/skia_bindings.gyp:gpu_skia_bindings',
         '../ipc/ipc.gyp:ipc',
         '../media/media.gyp:media',
         '../media/media.gyp:shared_memory_support',
         '../mojo/mojo.gyp:mojo_environment_chromium',
-        '../mojo/mojo.gyp:mojo_system',
         '../mojo/mojo.gyp:mojo_system_impl',
         '../third_party/WebKit/public/blink.gyp:blink',
         '../ui/gl/gl.gyp:gl',
         '../webkit/common/gpu/webkit_gpu.gyp:webkit_gpu',
         '../webkit/common/webkit_common.gyp:webkit_common',
         '../webkit/storage_browser.gyp:webkit_storage_browser',
         '../webkit/storage_common.gyp:webkit_storage_common',
         'content.gyp:webkit_version',
       ],
     }],
@@ skipping 232 matching lines @@
         'common/sandbox_linux/bpf_renderer_policy_linux.cc',
         'common/sandbox_linux/bpf_renderer_policy_linux.h',
         'common/sandbox_linux/sandbox_bpf_base_policy_linux.cc',
         'common/sandbox_linux/sandbox_bpf_base_policy_linux.h',
       ],
     }, {
       'defines': ['USE_SECCOMP_BPF'],
     }],
   ],
 }