Deleted some obviously dead code. (#468)

Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

ethereum/jsonrpc/src/main/java/tech/pegasys/pantheon/ethereum/jsonrpc/internal/queries/BlockchainQueries.java

@@ -97,17 +97,6 @@ public class BlockchainQueries {
             .orElse(UInt256.ZERO));
   }
 
-  /**
-   * Returns the nonce of the given account at a specific block number.
-   *
-   * @param address The address of the account being queried.
-   * @param blockNumber The block number being queried.
-   * @return The nonce of the account.
-   */
-  public UInt256 getAccountNonce(final Address address, final long blockNumber) {
-    throw new UnsupportedOperationException();
-  }
-
   /**
    * Returns the balance of the given account at a specific block number.
    *
@@ -180,15 +169,6 @@ public class BlockchainQueries {
         .orElse(-1);
   }
 
-  /**
-   * Returns the number of transactions in the latest block.
-   *
-   * @return The number of transactions contained in the latest block.
-   */
-  public Optional<Integer> getTransactionCount() {
-    throw new UnsupportedOperationException();
-  }
-
   /**
    * Returns the number of transactions sent from the given address in the block at the given
    * height.
@@ -469,16 +449,6 @@ public class BlockchainQueries {
         txs.get(txIndex), header.getNumber(), blockHeaderHash, txIndex);
   }
 
-  /**
-   * Returns the transaction at the given index for the latest block.
-   *
-   * @param txIndex The index of the transaction to return.
-   * @return The transaction at the specified location.
-   */
-  public Optional<TransactionWithMetadata> transactionByIndex(final int txIndex) {
-    throw new UnsupportedOperationException();
-  }
-
   /**
    * Returns the transaction receipt associated with the given transaction hash.
    *