[Telemetry] Stop execution for unexpected exceptions

tools/perf/measurements/smoothness_unittest.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 import sys
 
 from measurements import smoothness
 from metrics import power
 from telemetry.core import exceptions
 from telemetry.core import wpr_modes
 from telemetry.page import page
-from telemetry.page import page_test
 from telemetry.unittest_util import options_for_unittests
 from telemetry.unittest_util import page_test_test_case
 from telemetry.unittest_util import test
 
 class FakeTracingController(object):
   def __init__(self):
     self.category_filter = None
   def Start(self, _options, category_filter, _timeout):
     self.category_filter = category_filter
 
@@ skipping 147 matching lines @@
 
     class BuggyMeasurement(smoothness.Smoothness):
       fake_power = None
       # Inject fake power metric.
       def WillStartBrowser(self, platform):
         self.fake_power = self._power_metric = FakePowerMetric(platform)
 
     measurement = BuggyMeasurement()
     try:
       self.RunMeasurement(measurement, ps)
-    except page_test.TestNotSupportedOnPlatformFailure:
+    except exceptions.IntentionalException:
       pass
 
     self.assertTrue(measurement.fake_power.start_called)
     self.assertTrue(measurement.fake_power.stop_called)