Remove WillRunPageRepeat and DidRunPageRpeat hooks since they are not used.

BUG=

Review URL: https://codereview.chromium.org/593183004

Cr-Commit-Position: refs/heads/master@{#296402}

tools/telemetry/telemetry/page/page_runner.py

@@ -423,7 +423,6 @@ def Run(test, page_set, expectations, finder_options, results):
         if test.IsExiting():
           break
 
-        test.WillRunPageRepeats(page)
         for _ in xrange(0, finder_options.page_repeat):
           results.WillRunPage(page)
           try:
@@ -437,7 +436,6 @@ def Run(test, page_set, expectations, finder_options, results):
               if test.discard_first_result:
                 discard_run = True
             results.DidRunPage(page, discard_run=discard_run)
-        test.DidRunPageRepeats(page)
         if (not max_failures is None and
             len(results.failures) > max_failures):
           logging.error('Too many failures. Aborting.')

tools/telemetry/telemetry/page/page_test.py

@@ -216,12 +216,6 @@ class PageTest(command_line.Command):
     """
     self.options = None
 
-  def WillRunPageRepeats(self, page):
-    """Override to do operations before each page is iterated over."""
-
-  def DidRunPageRepeats(self, page):
-    """Override to do operations after each page is iterated over."""
-
   def WillNavigateToPage(self, page, tab):
     """Override to do operations before the page is navigated, notably Telemetry
     will already have performed the following operations on the browser before