Remove uses of fee globals in wallet code

This commit does not change behavior.

src/interfaces/chain.cpp

@@ -6,6 +6,8 @@
 
 #include <chain.h>
 #include <chainparams.h>
+#include <policy/fees.h>
+#include <policy/policy.h>
 #include <policy/rbf.h>
 #include <primitives/block.h>
 #include <sync.h>
@@ -214,6 +216,18 @@ public:
         return ::mempool.CalculateMemPoolAncestors(entry, ancestors, limit_ancestor_count, limit_ancestor_size,
             limit_descendant_count, limit_descendant_size, unused_error_string);
     }
+    CFeeRate estimateSmartFee(int num_blocks, bool conservative, FeeCalculation* calc) override
+    {
+        return ::feeEstimator.estimateSmartFee(num_blocks, calc, conservative);
+    }
+    unsigned int estimateMaxBlocks() override
+    {
+        return ::feeEstimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
+    }
+    CFeeRate mempoolMinFee() override
+    {
+        return ::mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
+    }
 };
 
 } // namespace

src/interfaces/chain.h

@@ -19,6 +19,7 @@ class CScheduler;
 class CTransaction;
 class uint256;
 struct CBlockLocator;
+struct FeeCalculation;
 
 namespace interfaces {
 
@@ -145,6 +146,15 @@ public:
 
     //! Check chain limits.
     virtual bool checkChainLimits(CTransactionRef tx) = 0;
+
+    //! Estimate smart fee.
+    virtual CFeeRate estimateSmartFee(int num_blocks, bool conservative, FeeCalculation* calc = nullptr) = 0;
+
+    //! Fee estimator max target.
+    virtual unsigned int estimateMaxBlocks() = 0;
+
+    //! Pool min fee.
+    virtual CFeeRate mempoolMinFee() = 0;
 };
 
 //! Interface to let node manage chain clients (wallets, or maybe tools for

src/interfaces/wallet.cpp

@@ -457,7 +457,7 @@ public:
     {
         FeeCalculation fee_calc;
         CAmount result;
-        result = GetMinimumFee(*m_wallet, tx_bytes, coin_control, ::mempool, ::feeEstimator, &fee_calc);
+        result = GetMinimumFee(*m_wallet, tx_bytes, coin_control, &fee_calc);
         if (returned_target) *returned_target = fee_calc.returnedTarget;
         if (reason) *reason = fee_calc.reason;
         return result;