Move third_party/firefox_jsshell dependency to cloud storage

tools/testing/bin/jsshell

Index: tools/testing/bin/jsshell
diff --git a/tools/testing/bin/jsshell b/tools/testing/bin/jsshell
index 359950d73cba61a97c4236d1d13b0bd54dc088e0..6dec09f655722d04fe6b36afb023d0576078b6ef 100755
--- a/tools/testing/bin/jsshell
+++ b/tools/testing/bin/jsshell
@@ -3,14 +3,15 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
+JSDIR=${0%/*}/../../../third_party/firefox_jsshell
 
 case $OSTYPE in
     *[Dd]arwin*)
-        exec ${0%/*}/../../../third_party/firefox_jsshell/macos/js "$@"
+        exec $JSDIR/mac/jsshell/js "$@"
         ;;
     *[Ll]inux*)
-        LD_LIBRARY_PATH=${0%/*}/../../../third_party/firefox_jsshell/linux/ \
-            exec ${0%/*}/../../../third_party/firefox_jsshell/linux/js "$@"
+        LD_LIBRARY_PATH=$JSDIR/linux/jsshell/ \
+            exec $JSDIR/linux/jsshell/js "$@"
         ;;
     *)
         echo No jsshell binary for $(uname) >2