fix some warnings about unused values.

Author: Aurélien Richez

src/main/scala/io/iohk/ethereum/jsonrpc/CheckpointingService.scala

@@ -9,15 +9,13 @@ import io.iohk.ethereum.blockchain.sync.regular.RegularSync.NewCheckpoint
 import io.iohk.ethereum.consensus.blocks.CheckpointBlockGenerator
 import io.iohk.ethereum.crypto.ECDSASignature
 import io.iohk.ethereum.domain.Block
-import io.iohk.ethereum.domain.Blockchain
 import io.iohk.ethereum.domain.BlockchainReader
 import io.iohk.ethereum.domain.Checkpoint
 import io.iohk.ethereum.ledger.BlockQueue
 import io.iohk.ethereum.utils.ByteStringUtils
 import io.iohk.ethereum.utils.Logger
 
 class CheckpointingService(
-    blockchain: Blockchain,
     blockchainReader: BlockchainReader,
     blockQueue: BlockQueue,
     checkpointBlockGenerator: CheckpointBlockGenerator,

src/main/scala/io/iohk/ethereum/ledger/BlockImport.scala

@@ -86,7 +86,7 @@ class BlockImport(
   private def isPossibleNewBestBlock(newBlock: BlockHeader, currentBestBlock: BlockHeader): Boolean =
     newBlock.parentHash == currentBestBlock.hash && newBlock.number == currentBestBlock.number + 1
 
-  private def measureBlockMetrics(importResult: BlockImportResult)(implicit blockchainConfig: BlockchainConfig): Unit =
+  private def measureBlockMetrics(importResult: BlockImportResult): Unit =
     importResult match {
       case BlockImportedToTop(blockImportData) =>
         blockImportData.foreach(blockData => BlockMetrics.measure(blockData.block, blockchainReader.getBlockByHash))

src/main/scala/io/iohk/ethereum/nodebuilder/NodeBuilder.scala

@@ -570,7 +570,6 @@ trait CheckpointingServiceBuilder {
 
   lazy val checkpointingService =
     new CheckpointingService(
-      blockchain,
       blockchainReader,
       blockQueue,
       checkpointBlockGenerator,

src/test/scala/io/iohk/ethereum/jsonrpc/CheckpointingServiceSpec.scala

@@ -191,6 +191,6 @@ class CheckpointingServiceSpec
     val syncController: TestProbe = TestProbe()
     val checkpointBlockGenerator: CheckpointBlockGenerator = new CheckpointBlockGenerator()
     val service =
-      new CheckpointingService(blockchain, blockchainReader, blockQueue, checkpointBlockGenerator, syncController.ref)
+      new CheckpointingService(blockchainReader, blockQueue, checkpointBlockGenerator, syncController.ref)
   }
 }