Wrap the p2p transport API in a compile time flag.

content/content_browser.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'content_browser',
       'type': '<(library)',
       'dependencies': [
@@ skipping 203 matching lines @@
         'browser/renderer_host/database_message_filter.h',
         'browser/renderer_host/file_utilities_message_filter.cc',
         'browser/renderer_host/file_utilities_message_filter.h',
         'browser/renderer_host/global_request_id.h',
         'browser/renderer_host/gpu_message_filter.cc',
         'browser/renderer_host/gpu_message_filter.h',
         'browser/renderer_host/pepper_file_message_filter.cc',
         'browser/renderer_host/pepper_file_message_filter.h',
         'browser/renderer_host/pepper_message_filter.cc',
         'browser/renderer_host/pepper_message_filter.h',
-        'browser/renderer_host/p2p/socket_host.cc',
-        'browser/renderer_host/p2p/socket_host.h',
-        'browser/renderer_host/p2p/socket_host_tcp.cc',
-        'browser/renderer_host/p2p/socket_host_tcp.h',
-        'browser/renderer_host/p2p/socket_host_tcp_server.cc',
-        'browser/renderer_host/p2p/socket_host_tcp_server.h',
-        'browser/renderer_host/p2p/socket_host_udp.cc',
-        'browser/renderer_host/p2p/socket_host_udp.h',
-        'browser/renderer_host/p2p/socket_dispatcher_host.cc',
-        'browser/renderer_host/p2p/socket_dispatcher_host.h',
         'browser/renderer_host/quota_dispatcher_host.cc',
         'browser/renderer_host/quota_dispatcher_host.h',
         'browser/renderer_host/redirect_to_file_resource_handler.cc',
         'browser/renderer_host/redirect_to_file_resource_handler.h',
         'browser/renderer_host/render_message_filter.cc',
         'browser/renderer_host/render_message_filter.h',
         'browser/renderer_host/render_message_filter_gtk.cc',
         'browser/renderer_host/render_message_filter_win.cc',
         'browser/renderer_host/render_process_host.cc',
         'browser/renderer_host/render_process_host.h',
@@ skipping 94 matching lines @@
         'browser/worker_host/worker_message_filter.h',
         'browser/worker_host/worker_process_host.cc',
         'browser/worker_host/worker_process_host.h',
         'browser/worker_host/worker_service.cc',
         'browser/worker_host/worker_service.h',
         'browser/zygote_host_linux.cc',
         'browser/zygote_host_linux.h',
         'browser/zygote_main_linux.cc',
       ],
       'conditions': [
+        ['ppapi_transport==1', {
+          'sources': [
+            'browser/renderer_host/p2p/socket_host.cc',
+            'browser/renderer_host/p2p/socket_host.h',
+            'browser/renderer_host/p2p/socket_host_tcp.cc',
+            'browser/renderer_host/p2p/socket_host_tcp.h',
+            'browser/renderer_host/p2p/socket_host_tcp_server.cc',
+            'browser/renderer_host/p2p/socket_host_tcp_server.h',
+            'browser/renderer_host/p2p/socket_host_udp.cc',
+            'browser/renderer_host/p2p/socket_host_udp.h',
+            'browser/renderer_host/p2p/socket_dispatcher_host.cc',
+            'browser/renderer_host/p2p/socket_dispatcher_host.h',
+          ],
+        }],
         ['OS=="win"', {
           'msvs_guid': '639DB58D-32C2-435A-A711-65A12F62E442',
         }],
         ['OS=="linux"', {
           'dependencies': [
             '../build/linux/system.gyp:dbus-glib',
             # For FcLangSetAdd call in render_sandbox_host_linux.cc
             '../build/linux/system.gyp:fontconfig',
             '../build/linux/system.gyp:gtk',
             # For XShm* in backing_store_x.cc
@@ skipping 17 matching lines @@
             'mac_bundle_resources': [
               'browser/gpu.sb',
               'browser/worker.sb',
             ],
           },
         }],
       ],
     },
   ],
 }