Remove some unused NaCl srpc methods (AttachService, ctor variant)

components/nacl/renderer/plugin/srpc_client.h

Index: components/nacl/renderer/plugin/srpc_client.h
diff --git a/components/nacl/renderer/plugin/srpc_client.h b/components/nacl/renderer/plugin/srpc_client.h
index 4be0919c8c240b96d01e2186593106c746600de9..7bd4a04f472fbe0b49bd4006b7a23ea757f51fac 100644
--- a/components/nacl/renderer/plugin/srpc_client.h
+++ b/components/nacl/renderer/plugin/srpc_client.h
@@ -23,9 +23,7 @@ class DescWrapper;
 
 namespace plugin {
 
-class ErrorInfo;
 class MethodInfo;
-class Plugin;
 class SrpcParams;
 
 //  SrpcClient represents an SRPC connection to a client.
@@ -46,12 +44,9 @@ class SrpcClient {
   //  Invoke an SRPC method.
   bool Invoke(const std::string& method_name, SrpcParams* params);
   // Get the error status from that last method invocation
-  NaClSrpcError GetLastError() { return last_error_; }
+  NaClSrpcError GetLastError() const { return last_error_; }
   bool InitParams(const std::string& method_name, SrpcParams* params);
 
-  // Attach a service for reverse-direction (from .nexe) RPCs.
-  void AttachService(NaClSrpcService* service, void* instance_data);
-
  private:
   NACL_DISALLOW_COPY_AND_ASSIGN(SrpcClient);
   SrpcClient();