Move DispatchSourceMach from //sandbox/mac to //base/mac.

sandbox/mac/mach_message_server.h

Index: sandbox/mac/mach_message_server.h
diff --git a/sandbox/mac/mach_message_server.h b/sandbox/mac/mach_message_server.h
index 645b6918bcd13aedbb61711177fbcd6d6ec1e26a..20a543b3c7b6e091b73064d18462450a068c26aa 100644
--- a/sandbox/mac/mach_message_server.h
+++ b/sandbox/mac/mach_message_server.h
@@ -7,6 +7,7 @@
 
 #include <mach/mach.h>
 
+#include "base/mac/dispatch_source_mach.h"
 #include "base/mac/scoped_mach_port.h"
 #include "base/mac/scoped_mach_vm.h"
 #include "base/memory/scoped_ptr.h"
@@ -14,8 +15,6 @@
 
 namespace sandbox {
 
-class DispatchSourceMach;
-
 // A Mach message server that operates a receive port. Messages are received
 // and then passed to the MessageDemuxer for handling. The Demuxer
 // can use the server class to send a reply, forward the message to a
@@ -62,7 +61,7 @@ class MachMessageServer : public MessageServer {
   base::mac::ScopedMachVM reply_buffer_;
 
   // MACH_RECV dispatch source that handles the |server_port_|.
-  scoped_ptr<DispatchSourceMach> dispatch_source_;
+  scoped_ptr<base::DispatchSourceMach> dispatch_source_;
 
   // Whether or not ForwardMessage() was called during ReceiveMessage().
   bool did_forward_message_;