Delete now unused PageMeasurement class.

tools/perf/metrics/speedindex.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 collections
 
 from metrics import Metric
 from telemetry.core import bitmap
 from telemetry.value import scalar
 
@@ skipping 14 matching lines @@
     self._impl = None
 
   @classmethod
   def CustomizeBrowserOptions(cls, options):
     options.AppendExtraBrowserArgs('--disable-infobars')
 
   def Start(self, _, tab):
     """Start recording events.
 
     This method should be called in the WillNavigateToPage method of
-    a PageMeasurement, so that all the events can be captured. If it's called
+    a PageTest, so that all the events can be captured. If it's called
     in DidNavigateToPage, that will be too late.
     """
     self._impl = (VideoSpeedIndexImpl() if tab.video_capture_supported else
                   PaintRectSpeedIndexImpl())
     self._impl.Start(tab)
 
   def Stop(self, _, tab):
     """Stop timeline recording."""
     assert self._impl, 'Must call Start() before Stop()'
     assert self.IsFinished(tab), 'Must wait for IsFinished() before Stop()'
@@ skipping 252 matching lines @@
     frame = paint_event.args['frameId']
     return (frame,) + GetBox(paint_event.args['data']['clip'])
 
   def _GroupEventByRectangle(self, paint_events):
     """Group all paint events according to the rectangle that they update."""
     result = collections.defaultdict(list)
     for event in paint_events:
       assert event.name == 'Paint'
       result[self._GetRectangle(event)].append(event)
     return result