Unreviewed gardening: Mark test as flaky timeout

http/tests/security/cross-origin-worker-indexeddb-allowed.html continues
to timeout occasionally on all bots.

BUG=487671
TBR=timvolodine

Review URL: https://codereview.chromium.org/1140073002

git-svn-id: svn://svn.chromium.org/blink/trunk@195313 bbb929c8-8fbe-4397-9dbb-9b2b20218538
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index d2d3f24..d5090146 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -1941,3 +1941,5 @@
 crbug.com/478014 [ Mac ] fast/forms/button-white-space.html [ NeedsRebaseline ]
 crbug.com/478014 [ Mac ] fast/writing-mode/fallback-orientation.html [ NeedsRebaseline ]
 crbug.com/478014 [ Mac Win ] svg/css/text-shadow-multiple.xhtml [ NeedsRebaseline ]
+
+crbug.com/487671 http/tests/security/cross-origin-worker-indexeddb-allowed.html [ Pass Timeout ]