Remove obsolete comment and option.

Boot image from optimizing handles debuggable now.
As a side effect reduces the adb command line vogar needs to do.

Change-Id: Ib516163dee19d05de22be5a3228f51c8700411cf
diff --git a/tools/run-jdwp-tests.sh b/tools/run-jdwp-tests.sh
index 9aed271..2791bec 100755
--- a/tools/run-jdwp-tests.sh
+++ b/tools/run-jdwp-tests.sh
@@ -30,8 +30,6 @@
 
 art="/data/local/tmp/system/bin/art"
 art_debugee="sh /data/local/tmp/system/bin/art"
-# We use Quick's image on target because optimizing's image is not compiled debuggable.
-image="-Ximage:/data/art-test/core.art"
 args=$@
 debuggee_args="-Xcompiler-option --debuggable"
 device_dir="--device-dir=/data/local/tmp"