Remove seldom used tab_swtiching test cases

tools/perf/page_sets/five_blank_pages.py

Index: tools/perf/page_sets/five_blank_pages.py
diff --git a/tools/perf/page_sets/five_blank_pages.py b/tools/perf/page_sets/five_blank_pages.py
deleted file mode 100644
index caca894f4717ea7ebb9c420a1ff299f00cca1f73..0000000000000000000000000000000000000000
--- a/tools/perf/page_sets/five_blank_pages.py
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright 2014 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.page import page as page_module
-from telemetry import story
-
-
-# The PageSet searches for pages relative to the directory the page class is
-# defined in so we need to subclass here.
-class BlankPage(page_module.Page):
-  def __init__(self, ps, prefix):
-    super(BlankPage, self).__init__('file://blank_page/blank_page.html', ps,
-                                    name=prefix+'_blank')
-
-
-class FiveBlankPagesPageSet(story.StorySet):
-
-  """ Five blank pages. """
-
-  def __init__(self):
-    super(FiveBlankPagesPageSet, self).__init__()
-    for i in xrange(5):
-      self.AddStory(BlankPage(self, str(i)))