Mac C++ compile fix

include/grpc++/channel_interface.h

@@ -34,6 +34,8 @@
 #ifndef GRPCXX_CHANNEL_INTERFACE_H
 #define GRPCXX_CHANNEL_INTERFACE_H
 
+#include <memory>
+
 #include <grpc++/status.h>
 #include <grpc++/impl/call.h>
 
@@ -47,7 +49,9 @@ class CompletionQueue;
 class RpcMethod;
 class CallInterface;
 
-class ChannelInterface : public CallHook {
+class ChannelInterface 
+	: public CallHook, 
+      public std::enable_shared_from_this<ChannelInterface> {
  public:
   virtual ~ChannelInterface() {}
 

src/cpp/client/channel.h

@@ -51,7 +51,6 @@ class Credentials;
 class StreamContextInterface;
 
 class Channel GRPC_FINAL : public GrpcLibrary,
-                           public std::enable_shared_from_this<Channel>,
                            public ChannelInterface {
  public:
   Channel(const grpc::string& target, grpc_channel* c_channel);