Run crashing test only on release builds because it's slow on debug

fast/dom/shadow/focus-controller-recursion-crash.html was marked SLOW,
but it would be suffice to run it on release builds
to catch any regression.
Disable the test on debug builds.

Original CL: https://codereview.chromium.org/1204213002/
SLOW marked at: https://codereview.chromium.org/1208213002/

BUG=445194
TEST=check if the test is run on release, skipped on debug

Review URL: https://codereview.chromium.org/1208333003

git-svn-id: svn://svn.chromium.org/blink/trunk@197889 bbb929c8-8fbe-4397-9dbb-9b2b20218538
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index 5a4c475..25bc55f 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -1722,3 +1722,6 @@
 
 # Very flaky on Win Debug since it was last updated in r191233
 crbug.com/461903 [ Win Debug ] media/encrypted-media/encrypted-media-waiting-for-a-key.html [ Pass Failure ] 
+
+# Slow expected on debug builds
+crbug.com/445194 [ Debug ] fast/dom/shadow/focus-controller-recursion-crash.html [ Skip ]