Extend existing blink test expectations for slow tests.

The test plugins/js-from-destroy.html has crash and timeout expectations for some configurations but not on windows release. Add 'slow', since there is a timeout only on the v8 waterfall and only for windows release.

BUG=webkit.org/b/48655
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/20082002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15852 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/blink_tests/TestExpectations

@@ -25,3 +25,6 @@ crbug.com/178745 [ Win Debug ] plugins/open-and-close-window-with-plugin.html [
 [ Linux Debug ] fast/js/regress/function-dot-apply.html [ Slow ]
 crbug.com/249894 [ Linux Debug ] fast/js/regress/inline-arguments-access.html  [ Pass Failure Crash Slow ]
 [ Linux Debug ] fast/js/regress/inline-arguments-local-escape.html [ Slow ]
+
+# Slow on windows:
+webkit.org/b/48655 [ Win ] plugins/js-from-destroy.html [ Crash Slow ]