bpo-36895: remove time.clock() as per removal notice. (GH-13270)

`time.clock()` was deprecated in 3.3, and marked for removal removal in
3.8; this thus remove it from the time module.
diff --git a/Lib/test/test_time.py b/Lib/test/test_time.py
index 42799b2..f790d43 100644
--- a/Lib/test/test_time.py
+++ b/Lib/test/test_time.py
@@ -88,17 +88,6 @@
             check_ns(time.clock_gettime(time.CLOCK_REALTIME),
                      time.clock_gettime_ns(time.CLOCK_REALTIME))
 
-    @unittest.skipUnless(hasattr(time, 'clock'),
-                         'need time.clock()')
-    def test_clock(self):
-        with self.assertWarns(DeprecationWarning):
-            time.clock()
-
-        with self.assertWarns(DeprecationWarning):
-            info = time.get_clock_info('clock')
-        self.assertTrue(info.monotonic)
-        self.assertFalse(info.adjustable)
-
     @unittest.skipUnless(hasattr(time, 'clock_gettime'),
                          'need time.clock_gettime()')
     def test_clock_realtime(self):
@@ -553,15 +542,9 @@
 
     def test_get_clock_info(self):
         clocks = ['monotonic', 'perf_counter', 'process_time', 'time']
-        if hasattr(time, 'clock'):
-            clocks.append('clock')
 
         for name in clocks:
-            if name == 'clock':
-                with self.assertWarns(DeprecationWarning):
-                    info = time.get_clock_info('clock')
-            else:
-                info = time.get_clock_info(name)
+            info = time.get_clock_info(name)
 
             #self.assertIsInstance(info, dict)
             self.assertIsInstance(info.implementation, str)