Really fix target gtest dependencies

In 64006834b26f7138131fac87c3b0973cda70e560 we started depending on
TARGET_CORE_JARS which are phony targets and undefined when using
"mm test-art-target".

Change-Id: I671c5d6068ff999782ad5f388f3077f4c1594884
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index de0e3bd..0579f9b 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -61,8 +61,8 @@
 # The elf writer test has dependencies on core.oat.
 ART_GTEST_elf_writer_test_HOST_DEPS := $(HOST_CORE_OAT_OUT) $(2ND_HOST_CORE_OAT_OUT)
 ART_GTEST_elf_writer_test_TARGET_DEPS := $(TARGET_CORE_OAT_OUT) $(2ND_TARGET_CORE_OAT_OUT)
-ART_GTEST_jni_internal_test_TARGET_DEPS := $(TARGET_CORE_JARS)
-ART_GTEST_proxy_test_TARGET_DEPS := $(TARGET_CORE_JARS)
+ART_GTEST_jni_internal_test_TARGET_DEPS := $(TARGET_CORE_DEX_FILES)
+ART_GTEST_proxy_test_TARGET_DEPS := $(TARGET_CORE_DEX_FILES)
 ART_GTEST_proxy_test_HOST_DEPS := $(HOST_CORE_OAT_OUT) $(2ND_HOST_CORE_OAT_OUT)
 
 # The path for which all the source files are relative, not actually the current directory.