Fix Android framework builds

R=mtklein@google.com

Review URL: https://codereview.chromium.org/450503002

platform_tools/android/gyp_gen/makefile_writer.py

@@ -117,15 +117,11 @@ SKIA_TOOLS = (
 #
 
 # benchmark (timings)
-include $(BASE_PATH)/bench/Android.mk
 include $(BASE_PATH)/tools/Android.mk
 
 # golden-master (fidelity / regression test)
 include $(BASE_PATH)/gm/Android.mk
 
-# unit-tests
-include $(BASE_PATH)/tests/Android.mk
-
 # diamond-master (one test to rule them all)
 include $(BASE_PATH)/dm/Android.mk
 """