Revert of Revert of [Telemetry] Set the number of attempts to retry a test if browser or tab crash to 1

tools/telemetry/telemetry/page/page_runner_unittest.py

Index: tools/telemetry/telemetry/page/page_runner_unittest.py
diff --git a/tools/telemetry/telemetry/page/page_runner_unittest.py b/tools/telemetry/telemetry/page/page_runner_unittest.py
index 894c84f8da3a07484ad61f7a6a42fce479dc5910..46af39b97144499e23b75ee841dc544a00692b1d 100644
--- a/tools/telemetry/telemetry/page/page_runner_unittest.py
+++ b/tools/telemetry/telemetry/page/page_runner_unittest.py
@@ -187,6 +187,10 @@
         if not self.has_crashed:
           self.has_crashed = True
           raise exceptions.BrowserGoneException(tab.browser)
+
+      @property
+      def attempts(self):
+        return 3
 
     options = options_for_unittests.GetCopy()
     options.output_formats = ['csv']