remove GetMedianTime( ) which is never used

src/main.cpp

@@ -2575,19 +2575,6 @@ bool CBlockIndex::IsSuperMajority(int minVersion, const CBlockIndex* pstart, uns
     return (nFound >= nRequired);
 }
 
-int64_t CBlockIndex::GetMedianTime() const
-{
-    AssertLockHeld(cs_main);
-    const CBlockIndex* pindex = this;
-    for (int i = 0; i < nMedianTimeSpan/2; i++)
-    {
-        if (!chainActive.Next(pindex))
-            return GetBlockTime();
-        pindex = chainActive.Next(pindex);
-    }
-    return pindex->GetMedianTimePast();
-}
-
 void PushGetBlocks(CNode* pnode, CBlockIndex* pindexBegin, uint256 hashEnd)
 {
     AssertLockHeld(cs_main);

src/main.h

@@ -849,8 +849,6 @@ public:
         return pbegin[(pend - pbegin)/2];
     }
 
-    int64_t GetMedianTime() const;
-
     /**
      * Returns true if there are nRequired or more blocks of minVersion or above
      * in the last nToCheck blocks, starting at pstart and going backwards.