Remove some page_cycler benchmarks that have been disabled for a long time

tools/perf/benchmarks/page_cycler.py

Index: tools/perf/benchmarks/page_cycler.py
diff --git a/tools/perf/benchmarks/page_cycler.py b/tools/perf/benchmarks/page_cycler.py
index de19ab40deea0752f95c89a2f73440466b006ff9..9ae276961b238af1dce672cbe155c87da5873025 100644
--- a/tools/perf/benchmarks/page_cycler.py
+++ b/tools/perf/benchmarks/page_cycler.py
@@ -147,16 +147,6 @@ class PageCyclerTop10Mobile(_PageCycler):
     return stories
 
 
-@benchmark.Disabled('all')
-class PageCyclerKeyMobileSites(_PageCycler):
-  """Page load time benchmark for key mobile sites."""
-  page_set = page_sets.KeyMobileSitesPageSet
-
-  @classmethod
-  def Name(cls):
-    return 'page_cycler.key_mobile_sites_smooth'
-
-
 @benchmark.Disabled('android')  # crbug.com/357326
 class PageCyclerToughLayoutCases(_PageCycler):
   """Page loading for the slowest layouts observed in the Alexa top 1 million.
@@ -217,12 +207,3 @@ class PageCyclerBasicOopif(_PageCycler):
   @classmethod
   def ShouldDisable(cls, possible_browser):
     return cls.IsSvelte(possible_browser)  # http://crbug.com/607657
-
-
-@benchmark.Disabled('all')  # crbug.com/443730
-class PageCyclerBigJs(_PageCycler):
-  page_set = page_sets.BigJsPageSet
-
-  @classmethod
-  def Name(cls):
-    return 'page_cycler.big_js'