Use CommonRuntimeTest::boot_class_path_ in DexMethodIteratorTest

In addition, remove some other unnecessary dependencies.

Change-Id: I5ec97b54c3c064ea98feb70dbfd226118ec98290
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index 0259fb4..f9cbec5 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -61,10 +61,9 @@
 # The elf writer test has dependencies on core.oat.
 ART_GTEST_elf_writer_test_HOST_DEPS := $(HOST_CORE_IMAGE_default_no-pic_64) $(HOST_CORE_IMAGE_default_no-pic_32)
 ART_GTEST_elf_writer_test_TARGET_DEPS := $(TARGET_CORE_IMAGE_default_no-pic_64) $(TARGET_CORE_IMAGE_default_no-pic_32)
-ART_GTEST_jni_internal_test_TARGET_DEPS := $(TARGET_CORE_DEX_FILES)
-ART_GTEST_proxy_test_TARGET_DEPS := $(TARGET_CORE_DEX_FILES)
+
+# TODO: document why this is needed.
 ART_GTEST_proxy_test_HOST_DEPS := $(HOST_CORE_IMAGE_default_no-pic_64) $(HOST_CORE_IMAGE_default_no-pic_32)
-ART_GTEST_dex_method_iterator_test_TARGET_DEPS := $(TARGET_CORE_DEX_FILES)
 
 # The path for which all the source files are relative, not actually the current directory.
 LOCAL_PATH := art