Remove the astl tests from testrunner.

astl is dead.

Change-Id: I54c17eb55d04e1512d0af6a16401d21deebdd130
diff --git a/testrunner/test_defs.xml b/testrunner/test_defs.xml
index ada90d2..f281fba 100644
--- a/testrunner/test_defs.xml
+++ b/testrunner/test_defs.xml
@@ -515,12 +515,6 @@
     build_path="external/skia/tests"
     description="Skia tests." />
 
-<!--  Android STL tests -->
-<test-native name="astl"
-    build_path="external/astl/tests"
-    description="Android STL."
-    extra_build_args="ASTL_TESTS=1" />
-
 <!-- Google Test -->
 <test-native name="gtest"
     build_path="external/gtest"