Mark mozilla tests as flaky instead of failing

Apparently, they work on windows

BUG=v8:2893
TBR=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/23583046

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16787 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mozilla/mozilla.status

@@ -49,8 +49,8 @@ def FAIL_OK = FAIL, OKAY
 
 # BUG(2893): These tests started to fail after i18n support was turned on. Need
 # to investigate why.
-ecma_3/Number/15.7.4.3-02: FAIL
-ecma_3/Date/15.9.5.5-02: FAIL
+ecma_3/Number/15.7.4.3-02: FAIL_OK
+ecma_3/Date/15.9.5.5-02: FAIL_OK
 
 ##################### SKIPPED TESTS #####################