[Android] Clear gtest app's data on tear down.

build/android/pylib/gtest/test_runner.py

Index: build/android/pylib/gtest/test_runner.py
diff --git a/build/android/pylib/gtest/test_runner.py b/build/android/pylib/gtest/test_runner.py
index 70d393c9abf24c076a106390e599fac3e5a1374e..8db2f83450aec6d88e33ca35ea5b9808e1218d0e 100644
--- a/build/android/pylib/gtest/test_runner.py
+++ b/build/android/pylib/gtest/test_runner.py
@@ -188,10 +188,6 @@ class TestRunner(base_test_runner.BaseTestRunner):
   #override
   def TearDown(self):
     """Cleans up the test enviroment for the test suite."""
-    # Content shell creates a profile on the sdscard which accumulates cache
-    # files over time.
-    self.adb.RunShellCommand('rm -r ' +
-        os.path.join(self.adb.GetExternalStorage(), 'content_shell'),
-        timeout_time=60 * 2)
+    self.test_package.ClearApplicationState(self.adb)
     self.tool.CleanUpEnvironment()
     super(TestRunner, self).TearDown()