Disable these tests only on debug build. They're expected to fail on debug build.

third_party/WebKit/LayoutTests/TestExpectations

Index: third_party/WebKit/LayoutTests/TestExpectations
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index 4c3daaf6543ba1e919dba72e729d3143ad3642ae..05f7597b44b5a50f9f4882a5705bf3a15c7111d0 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -221,10 +221,13 @@ crbug.com/542541 [ Debug ] virtual/pointerevent/fast/events/click-count.html [ P
 # TODO(oshima): Mac Android are currently not supported.
 crbug.com/567837 [ Mac Android ] virtual/scalefactor200withzoom/fast/hidpi/static [ Skip ]
 
-# TODO(oshima): Debug build generates slightly different image for these tests.
+# TODO(oshima): Debug build generates slightly different image for these tests due to different background color.
 #crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/calendar-picker-appearance.html [ Skip ]
 crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/data-suggestion-picker-appearance.html [ Skip ]
 crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/popup-menu-appearance.html [ Skip ]
+crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/calendar-picker-appearance.html [ Skip ]
+crbug.com/593567 [ Debug ] virtual/scalefactor200/fast/hidpi/static/calendar-picker-appearance.html [ Skip ]
+crbug.com/593567 [ Debug ] virtual/scalefactor200withzoom/fast/hidpi/static/calendar-picker-appearance.html [ Skip ]
 
 # Mac does not support fractional scale factor.
 crbug.com/567837 [ Mac ] virtual/scalefactor150/fast/hidpi/static [ Skip ]
@@ -1306,10 +1309,6 @@ crbug.com/178369 fast/table/max-width-integer-overflow.html [ NeedsManualRebasel
 crbug.com/600261 imported/wpt/mediacapture-streams/GUM-deny.html [ Failure ]
 crbug.com/600261 imported/wpt/mediacapture-streams/MediaStream-MediaElement-srcObject.html [ Failure ]
 
-crbug.com/593679 virtual/scalefactor150/fast/hidpi/static/calendar-picker-appearance.html [ NeedsManualRebaseline ]
-crbug.com/593679 virtual/scalefactor200/fast/hidpi/static/calendar-picker-appearance.html [ NeedsManualRebaseline ]
-crbug.com/593679 virtual/scalefactor200withzoom/fast/hidpi/static/calendar-picker-appearance.html [ NeedsManualRebaseline ]
-
 crbug.com/605525 [ Win ] http/tests/xmlhttprequest/redirect-cross-origin-post.html [ Failure Pass ]
 
 crbug.com/603703 [ Linux Mac ] imported/wpt/web-animations/animation-timeline/document-timeline.html [ Failure Pass ]