message: node/chainstate: Decouple from GetTimeMillis
  ...instead just move it out
diff: #include <chainparams.h> // for CChainParams
  #include <rpc/blockchain.h> // for RPCNotifyBlockChange
  -#include <util/time.h> // for GetTime, GetTimeMillis
  +#include <util/time.h> // for GetTime
  #include <util/translation.h> // for bilingual_str
  #include <node/blockstorage.h> // for CleanupBlockRevFiles, fHavePruned, fReindex
  #include <node/context.h> // for NodeContext
  @@ -31,7 +31,6 @@ bool LoadChainstate(bool& fLoaded,
  };
  do {
  - const int64_t load_block_index_start_time = GetTimeMillis();
  try {
  LOCK(cs_main);
  chainman.InitializeChainstate(Assert(node.mempool.get()));
  @@ -197,7 +196,6 @@ bool LoadChainstate(bool& fLoaded,
  if (!failed_verification) {
  fLoaded = true;
  - LogPrintf(" block index %15dms\n", GetTimeMillis() - load_block_index_start_time);
  }
  } while(false);
  return true;
  