Trivial: Remove unneeded includes from .h:

- validation.h doesn't need to include chain.h anymore
- Remove unneeded includes from net.h

Author: jtimon

src/net.h

@@ -11,7 +11,6 @@
 #include "amount.h"
 #include "bloom.h"
 #include "compat.h"
-#include "fs.h"
 #include "hash.h"
 #include "limitedmap.h"
 #include "netaddress.h"
@@ -36,7 +35,6 @@
 #include <boost/foreach.hpp>
 #include <boost/signals2/signal.hpp>
 
-class CAddrMan;
 class CScheduler;
 class CNode;
 

src/validation.cpp

@@ -6,6 +6,7 @@
 #include "validation.h"
 
 #include "arith_uint256.h"
+#include "chain.h"
 #include "chainparams.h"
 #include "checkpoints.h"
 #include "checkqueue.h"

src/validation.h

@@ -11,7 +11,6 @@
 #endif
 
 #include "amount.h"
-#include "chain.h"
 #include "coins.h"
 #include "fs.h"
 #include "protocol.h" // For CMessageHeader::MessageStartChars