use auto for steady clock and chrono::milliseconds

test/vm.cpp

@@ -32,8 +32,6 @@ using namespace dev;
 using namespace dev::eth;
 using namespace dev::test;
 
-using Millisecs = chrono::duration<int,milli>;
-
 FakeExtVM::FakeExtVM(eth::BlockInfo const& _previousBlock, eth::BlockInfo const& _currentBlock, unsigned _depth):			/// TODO: XXX: remove the default argument & fix.
 	ExtVMFace(Address(), Address(), Address(), 0, 1, bytesConstRef(), bytes(), _previousBlock, _currentBlock, test::lastHashes(_currentBlock.number), _depth) {}
 
@@ -522,12 +520,12 @@ BOOST_AUTO_TEST_CASE(vmPerformanceTest)
 		string arg = boost::unit_test::framework::master_test_suite().argv[i];
 		if (arg == "--performance")
 		{
-			chrono::steady_clock::time_point start = chrono::steady_clock::now();
+			auto start = chrono::steady_clock::now();
 
 			dev::test::executeTests("vmPerformanceTest", "/VMTests", dev::test::doVMTests);
 
-			chrono::steady_clock::time_point end = chrono::steady_clock::now();
-			Millisecs duration(chrono::duration_cast<Millisecs>(end - start));
+			auto end = chrono::steady_clock::now();
+			chrono::milliseconds duration(chrono::duration_cast<chrono::milliseconds>(end - start));
 			cnote << "test duration: " << duration.count() << " milliseconds.\n";
 		}
 	}
@@ -540,12 +538,12 @@ BOOST_AUTO_TEST_CASE(vmInputLimitsTest1)
 		string arg = boost::unit_test::framework::master_test_suite().argv[i];
 		if (arg == "--inputlimits")
 		{
-			chrono::steady_clock::time_point start = chrono::steady_clock::now();
+			auto start = chrono::steady_clock::now();
 
 			dev::test::executeTests("vmInputLimitsTest1", "/VMTests", dev::test::doVMTests);
 
-			chrono::steady_clock::time_point end = chrono::steady_clock::now();
-			Millisecs duration(chrono::duration_cast<Millisecs>(end - start));
+			auto end = chrono::steady_clock::now();
+			chrono::milliseconds duration(chrono::duration_cast<chrono::milliseconds>(end - start));
 			cnote << "test duration: " << duration.count() << " milliseconds.\n";
 		}
 	}