Revert of Remove all reference to carbon api

webrtc/base/macutils.h

Index: webrtc/base/macutils.h
diff --git a/webrtc/base/macutils.h b/webrtc/base/macutils.h
index fdcb3eee5b7162e82f8eaf04284da9126c513631..78c442f0e9a4bd9ddd8ee39e93cd3a044cfe2dc2 100644
--- a/webrtc/base/macutils.h
+++ b/webrtc/base/macutils.h
@@ -12,6 +12,9 @@
 #define WEBRTC_BASE_MACUTILS_H__
 
 #include <CoreFoundation/CoreFoundation.h>
+#if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
+#include <Carbon/Carbon.h>
+#endif
 #include <string>
 
 namespace rtc {
@@ -41,6 +44,10 @@
 };
 
 MacOSVersionName GetOSVersionName();
+
+// Runs the given apple script. Only supports scripts that does not
+// require user interaction.
+bool RunAppleScript(const std::string& script);
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////