Move SystemInfo to rtc_base_approved and delete unused code.

webrtc/base/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 128 matching lines @@
     "platform_file.h",
     "platform_thread.cc",
     "platform_thread.h",
     "safe_conversions.h",
     "safe_conversions_impl.h",
     "scoped_ptr.h",
     "stringencode.cc",
     "stringencode.h",
     "stringutils.cc",
     "stringutils.h",
+    "systeminfo.cc",
+    "systeminfo.h",
     "template_util.h",
     "thread_annotations.h",
     "thread_checker.h",
     "thread_checker_impl.cc",
     "thread_checker_impl.h",
     "timeutils.cc",
     "timeutils.h",
     "trace_event.h",
   ]
 
@@ skipping 146 matching lines @@
     "sslidentity.cc",
     "sslidentity.h",
     "sslsocketfactory.cc",
     "sslsocketfactory.h",
     "sslstreamadapter.cc",
     "sslstreamadapter.h",
     "sslstreamadapterhelper.cc",
     "sslstreamadapterhelper.h",
     "stream.cc",
     "stream.h",
-    "systeminfo.cc",
-    "systeminfo.h",
     "task.cc",
     "task.h",
     "taskparent.cc",
     "taskparent.h",
     "taskrunner.cc",
     "taskrunner.h",
     "thread.cc",
     "thread.h",
     "timing.cc",
     "timing.h",
@@ skipping 302 matching lines @@
     defines += [ "CARBON_DEPRECATED=YES" ]
   }
 
   if (is_linux || is_android) {
     sources += [
       "linux.cc",
       "linux.h",
     ]
   }
 }