Remove junit from our core image.

It's not used, and when we run art with vogar, we get
incompatibilities. For example vogar's TestSuite class
is very different than junit's TestSuite.

Change-Id: I45c78d86c09c28b6136a6e50f6a08a746103794a
diff --git a/build/Android.common_path.mk b/build/Android.common_path.mk
index e0c0b0c..2d6b6a3 100644
--- a/build/Android.common_path.mk
+++ b/build/Android.common_path.mk
@@ -80,7 +80,7 @@
 TARGET_CORE_IMG_LOCATION := $(ART_TARGET_TEST_OUT)/core.art
 
 # Jar files for core.art.
-TARGET_CORE_JARS := core-libart conscrypt okhttp core-junit bouncycastle
+TARGET_CORE_JARS := core-libart conscrypt okhttp bouncycastle
 HOST_CORE_JARS := $(addsuffix -hostdex,$(TARGET_CORE_JARS))
 
 HOST_CORE_DEX_LOCATIONS   := $(foreach jar,$(HOST_CORE_JARS),  $(HOST_OUT_JAVA_LIBRARIES)/$(jar).jar)
diff --git a/tools/run-jdwp-tests.sh b/tools/run-jdwp-tests.sh
index 17c4556..77e8004 100755
--- a/tools/run-jdwp-tests.sh
+++ b/tools/run-jdwp-tests.sh
@@ -22,7 +22,7 @@
 # Jar containing all the tests.
 test_jar=out/host/linux-x86/framework/apache-harmony-jdwp-tests-hostdex.jar
 
-if [ ! -f $test_jar -o ! -f $junit_jar ]; then
+if [ ! -f $test_jar ]; then
   echo "Before running, you must build jdwp tests and vogar:" \
        "make apache-harmony-jdwp-tests-hostdex vogar vogar.jar"
   exit 1