Always include debugger support.

src/debug-agent.cc

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-#ifdef ENABLE_DEBUGGER_SUPPORT
-
 #include "v8.h"
 #include "debug.h"
 #include "debug-agent.h"
 #include "platform/socket.h"
 
 namespace v8 {
 namespace internal {
 
 // Public V8 debugger API message handler function. This function just delegates
 // to the debugger agent through it's data parameter.
@@ skipping 457 matching lines @@
     int received = conn->Receive(data + total_received, len - total_received);
     if (received == 0) {
       return total_received;
     }
     total_received += received;
   }
   return total_received;
 }
 
 } }  // namespace v8::internal
-
-#endif  // ENABLE_DEBUGGER_SUPPORT