Mark update-widget-positions-on-nested-frames-and-scrollers.html flaky

BUG=432790
TBR=senorblanco@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/722723006

git-svn-id: svn://svn.chromium.org/blink/trunk@185269 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -1377,6 +1377,8 @@ crbug.com/429133 [ SnowLeopard ] virtual/textblob/fast/text/text-combine-shrink-
 crbug.com/384723 accessibility/chromium-only-roles.html [ Failure ]
 crbug.com/385014 accessibility/canvas-fallback-content-2.html [ Failure ]
 
+crbug.com/432790 [ XP ] virtual/prefer_compositing_to_lcd_text/compositing/overflow/update-widget-positions-on-nested-frames-and-scrollers.html  [ Failure ]
+
 crbug.com/431152 inspector/audits/audits-panel-functional.html [ Pass Failure ]
 crbug.com/431778 [ Win7 Linux Debug ] http/tests/security/shape-image-cors.html [ Pass Crash ]
 crbug.com/431643 [ Win ] http/tests/w3c/webperf/submission/Intel/resource-timing/test_resource_timing_cross_origin_redirect_chain_allow_timing.html [ Pass Failure ]