Make content/common compile on Linux GN build.

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 454 matching lines @@
   ],
   'target_conditions': [
     ['OS=="android" and <(use_seccomp_bpf)==1', {
       'sources/': [
         ['include', '^common/sandbox_linux/sandbox_bpf_base_policy_linux\\.cc$'],
         ['include', '^common/sandbox_linux/sandbox_bpf_base_policy_linux\\.h$'],
       ],
     }],
   ],
   'conditions': [
-    ['use_aura==1', {
-      'sources!': [
-        'common/cursors/webcursor_mac.mm',
-      ],
-    }],
     ['OS=="ios"', {
       # iOS has different user-agent construction utilities, since the
       # version strings is not derived from webkit_version, and follows
       # a different format.
       'sources!': [
         'common/user_agent.cc',
       ],
       'sources/': [
         # iOS only needs a small portion of content; exclude all the
         # implementation, and re-include what is used.
@@ skipping 301 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'],
     }],
   ],
 }