Revert of Added tombstones in instrumentation tests results.

build/android/pylib/instrumentation/instrumentation_test_instance.py

Index: build/android/pylib/instrumentation/instrumentation_test_instance.py
diff --git a/build/android/pylib/instrumentation/instrumentation_test_instance.py b/build/android/pylib/instrumentation/instrumentation_test_instance.py
index 9fd4d21ecb4e13373d2205ba9b4684636ffcea8f..62e62b8034a77649bb69cf741d092d57960f916f 100644
--- a/build/android/pylib/instrumentation/instrumentation_test_instance.py
+++ b/build/android/pylib/instrumentation/instrumentation_test_instance.py
@@ -393,9 +393,6 @@
     self._coverage_directory = None
     self._initializeTestCoverageAttributes(args)
 
-    self._store_tombstones = False
-    self._initializeTombstonesAttributes(args)
-
   def _initializeApkAttributes(self, args, error_func):
     if args.apk_under_test:
       apk_under_test_path = args.apk_under_test
@@ -538,9 +535,6 @@
   def _initializeTestCoverageAttributes(self, args):
     self._coverage_directory = args.coverage_dir
 
-  def _initializeTombstonesAttributes(self, args):
-    self._store_tombstones = args.store_tombstones
-
   @property
   def additional_apks(self):
     return self._additional_apks
@@ -580,10 +574,6 @@
   @property
   def screenshot_dir(self):
     return self._screenshot_dir
-
-  @property
-  def store_tombstones(self):
-    return self._store_tombstones
 
   @property
   def suite(self):