scripted-diff: Rename SetBestChain callback ChainStateFlushed

This much more accurately captures the meaning of the callback.

-BEGIN VERIFY SCRIPT-
sed -i 's/SetBestChain/ChainStateFlushed/g' src/validationinterface.h src/validationinterface.cpp src/wallet/wallet.h src/wallet/wallet.cpp src/validation.cpp src/index/txindex.h src/index/txindex.cpp
-END VERIFY SCRIPT-

src/index/txindex.cpp

@@ -192,7 +192,7 @@ void TxIndex::BlockConnected(const std::shared_ptr<const CBlock>& block, const C
     }
 }
 
-void TxIndex::SetBestChain(const CBlockLocator& locator)
+void TxIndex::ChainStateFlushed(const CBlockLocator& locator)
 {
     if (!m_synced) {
         return;
@@ -211,7 +211,7 @@ void TxIndex::SetBestChain(const CBlockLocator& locator)
         return;
     }
 
-    // This checks that SetBestChain callbacks are received after BlockConnected. The check may fail
+    // This checks that ChainStateFlushed callbacks are received after BlockConnected. The check may fail
     // immediately after the the sync thread catches up and sets m_synced. Consider the case where
     // there is a reorg and the blocks on the stale branch are in the ValidationInterface queue
     // backlog even after the sync thread has caught up to the new chain tip. In this unlikely

src/index/txindex.h

@@ -55,7 +55,7 @@ protected:
     void BlockConnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* pindex,
                         const std::vector<CTransactionRef>& txn_conflicted) override;
 
-    void SetBestChain(const CBlockLocator& locator) override;
+    void ChainStateFlushed(const CBlockLocator& locator) override;
 
 public:
     /// Constructs the TxIndex, which becomes available to be queried.