Revert of [Telemetry] Set the number of attempts to retry a test if browser or...

Revert of [Telemetry] Set the number of attempts to retry a test if browser or tab crash to 1 (patchset #2 id:20001 of https://codereview.chromium.org/659753003/)

Reason for revert:
Possible cause of gpu telemetry bot flake

Original issue's description:
> [Telemetry] Set the number of attempts to retry a test to 1
>
> **SHERIFFS: if telemetry perf tests on waterfall become more flaky, this patch can be safely reverted.
>
> BUG=422339
>
> Committed: https://crrev.com/f5b75f261be7779ccca14d09ddaabb3e4ee5ee03
> Cr-Commit-Position: refs/heads/master@{#299716}

TBR=tonyg@chromium.org,dtu@chromium.org,nednguyen@google.com
NOTREECHECKS=true
NOTRY=true
BUG=422339

Review URL: https://codereview.chromium.org/661303002

Cr-Commit-Position: refs/heads/master@{#300218}

tools/telemetry/telemetry/page/page_runner_unittest.py

@@ -188,10 +188,6 @@ class PageRunnerTests(unittest.TestCase):
           self.has_crashed = True
           raise exceptions.BrowserGoneException(tab.browser)
 
-      @property
-      def attempts(self):
-        return 3
-
     options = options_for_unittests.GetCopy()
     options.output_formats = ['csv']
     options.suppress_gtest_report = True

tools/telemetry/telemetry/page/page_test.py

@@ -133,7 +133,7 @@ class PageTest(command_line.Command):
   def attempts(self):
     """Maximum number of times test will be attempted."""
     # Do NOT override this method (crbug.com/422339).
-    return 1
+    return 3
 
   @property
   def max_failures(self):