mac: Make GetOSVersion() private to a cc file.

webrtc/base/macutils.cc

 /*
  *  Copyright 2007 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.
  */
 
@@ skipping 65 matching lines @@
   if (noErr == result) {
     *value = native_value;
     return true;
   }
   std::string str;
   DecodeFourChar(ostype, &str);
   LOG_E(LS_ERROR, OS, result) << "Gestalt(" << str << ")";
   return false;
 }
 
-bool GetOSVersion(int* major, int* minor, int* bugfix) {
+static bool GetOSVersion(int* major, int* minor, int* bugfix) {
   ASSERT(major && minor && bugfix);
   if (!GetGestalt(gestaltSystemVersion, major)) {
     return false;
   }
   if (*major < 0x1040) {
     *bugfix = *major & 0xF;
     *minor = (*major >> 4) & 0xF;
     *major = (*major >> 8);
     return true;
   }
@@ skipping 115 matching lines @@
 #else
   // TODO(thaloun): Support applescripts with the NSAppleScript API.
   return false;
 #endif  // CARBON_DEPRECATED
 }
 #endif  // WEBRTC_MAC && !defined(WEBRTC_IOS)
 
 ///////////////////////////////////////////////////////////////////////////////
 
 }  // namespace rtc