[Telemetry] Stop execution for unexpected exceptions

tools/telemetry/telemetry/page/page_test.py

Index: tools/telemetry/telemetry/page/page_test.py
diff --git a/tools/telemetry/telemetry/page/page_test.py b/tools/telemetry/telemetry/page/page_test.py
index b4e6c3c0fdd8e5e6886e12d59ed7ce9da1cb98c2..00bbbe7c8893c0829c993f51790b0a15b01b9ff2 100644
--- a/tools/telemetry/telemetry/page/page_test.py
+++ b/tools/telemetry/telemetry/page/page_test.py
@@ -6,20 +6,20 @@ from telemetry.page import test_expectations
 from telemetry.page.actions import action_runner as action_runner_module
 
 
-class Failure(Exception):
-  """Exception that can be thrown from PageTest to indicate an
-  undesired but designed-for problem."""
+class TestNotSupportedOnPlatformError(Exception):
+  """PageTest Exception raised when a required feature is unavailable.
+
+  The feature required to run the test could be part of the platform,
+  hardware configuration, or browser.
+  """
 
 
-class TestNotSupportedOnPlatformFailure(Failure):
-  """Exception that can be thrown to indicate that a certain feature required
-  to run the test is not available on the platform, hardware configuration, or
-  browser version."""
+class Failure(Exception):
+  """PageTest Exception raised when an undesired but designed-for problem."""
 
 
 class MeasurementFailure(Failure):
-  """Exception that can be thrown from MeasurePage to indicate an undesired but
-  designed-for problem."""
+  """PageTest Exception raised when an undesired but designed-for problem."""
 
 
 class PageTest(object):