Fix typo introduced in crrev.com/1843063004.

chrome/test/media_router/telemetry/benchmarks/pagesets/media_router_perf_pages.py

 # Copyright 2016 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.
 
 from telemetry import page
 from telemetry import story
 from benchmarks.pagesets import media_router_page
 from telemetry.core import exceptions
 from telemetry.page import shared_page_state
 
@@ skipping 105 matching lines @@
           action_runner,
           'stopSession();',
           lambda: not action_runner.EvaluateJavaScript('currentSession'),
           'Failed to stop session')
 
 
 class MediaRouterDialogPageSet(story.StorySet):
   """Pageset for media router dialog latency tests."""
 
   def __init__(self):
-    super(MediaRouterDailogPageSet, self).__init__(
+    super(MediaRouterDialogPageSet, self).__init__(
         cloud_storage_bucket=story.PARTNER_BUCKET)
     self.AddStory(CastDialogPage(self))
 
 
 class MediaRouterCPUMemoryPageSet(story.StorySet):
   """Pageset for media router CPU/memory usage tests."""
 
   def __init__(self):
     super(MediaRouterCPUMemoryPageSet, self).__init__(
         cloud_storage_bucket=story.PARTNER_BUCKET)
     self.AddStory(CastIdlePage(self))
     self.AddStory(CastFlingingPage(self))