Rely on the platform -std default.

Bug: http://b/32019064
Test: builds
Change-Id: I03f8e660cfff247e061c838d74761a4e61ae15e8
diff --git a/services/surfaceflinger/tests/Android.mk b/services/surfaceflinger/tests/Android.mk
index e5dffe5..4f1a8e6 100644
--- a/services/surfaceflinger/tests/Android.mk
+++ b/services/surfaceflinger/tests/Android.mk
@@ -3,8 +3,6 @@
 include $(CLEAR_VARS)
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
-LOCAL_CFLAGS := -std=c++14
-
 LOCAL_MODULE := SurfaceFlinger_test
 
 LOCAL_MODULE_TAGS := tests