remove some unused functions

Identified with `cppcheck --enable=unusedFunction .`.

 - GetSendBufferSize()'s last use removed in
   991955ee81034dc3fbc1c2a8e60c04fc9e0b538c
 - SetPort()'s last use removed in
   7e195e8459ad741368db6bb574981fccb1707268
 - GetfLargeWorkInvalidChainFound() was introduced in
   e3ba0ef95636290a3bb597ddd25d13ea13b034aa and never used

1 files changed, 0 insertions, 2 deletions

diff --git a/src/net.h b/src/net.h
index b9a11c62f2..1c9413c1dd 100644
--- a/src/net.h
+++ b/src/net.h
@@ -242,8 +242,6 @@ public:
     bool DisconnectNode(const std::string& node);
     bool DisconnectNode(NodeId id);
 
-    unsigned int GetSendBufferSize() const;
-
     ServiceFlags GetLocalServices() const;
 
     //!set the max outbound target in bytes