Some cleanup after https://codereview.chromium.org/2751433002

third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2

 # Expectations for slimming paint v2
 # See: https://docs.google.com/document/d/1QCM912Dr6u38DqyQqd7pxQxDy8FFOoWMMDq7uAXqKdA/view
 # We are focused on fast/, compositing/, and svg/ with all other directories skipped (for now).
 
 Bug(none) accessibility/ [ Skip ]
 Bug(none) app_banner/ [ Skip ]
 Bug(none) battery-status/ [ Skip ]
 Bug(none) bindings/ [ Skip ]
 Bug(none) bluetooth/ [ Skip ]
 Bug(none) canvas/ [ Skip ]
@@ skipping 935 matching lines @@
 Bug(none) fast/text/letter-spacing-negative-opacity.html [ Failure ]
 Bug(none) fast/text/softHyphen.html [ Failure ]
 Bug(none) fast/text/stroking-decorations.html [ Failure Pass ]
 Bug(none) fast/text/unicode-fallback-font.html [ Failure ]
 Bug(none) fast/text/whitespace/024.html [ Failure ]
 Bug(none) fast/text/whitespace/pre-wrap-spaces-after-newline.html [ Failure ]
 Bug(none) fast/text/word-break.html [ Failure ]
 Bug(none) fast/writing-mode/border-radius-clipping-vertical-lr.html [ Failure ]
 Bug(none) fast/writing-mode/fieldsets.html [ Failure ]
 Bug(none) svg/as-background-image/tiled-background-image.html [ Crash Timeout ]
+# Mask does not work correctly
+crbug.com/707444 svg/as-background-image/svg-as-background-6.html [ Failure ]
 Bug(none) svg/as-image/image-respects-pageScaleFactor.html [ Crash Timeout ]
 
 # Subpixel differences
+Bug(none) svg/as-background-image/svg-as-background-5.html [ Failure ]
 Bug(none) svg/batik/filters/feTile.svg [ Failure ]
 Bug(none) svg/batik/filters/filterRegions.svg [ Failure ]
 Bug(none) svg/batik/masking/maskRegions.svg [ Failure ]
 Bug(none) svg/batik/paints/gradientLimit.svg [ Failure ]
 Bug(none) svg/batik/paints/patternPreserveAspectRatioA.svg [ Failure ]
 Bug(none) svg/batik/paints/patternRegionA.svg [ Failure ]
 Bug(none) svg/batik/paints/patternRegions-positioned-objects.svg [ Failure ]
 Bug(none) svg/batik/paints/patternRegions.svg [ Failure ]
 Bug(none) svg/batik/text/longTextOnPath.svg [ Failure Timeout ]
 Bug(none) svg/batik/text/smallFonts.svg [ Crash Failure Timeout ]
@@ skipping 407 matching lines @@
 
 # Tests that fail after changes to border dash painting, due to antialiasing differences
 # and minor border radius clipping differences. Some SPv2 change is being ticked by the border
 # painting code.
 Bug(700530) fast/css/background-clip-values.html [ Failure ]
 Bug(700530) svg/text/small-fonts-in-html5.html [ Failure ]
 Bug(700530) compositing/overflow/paint-neg-z-order-descendants-into-scrolling-contents-layer.html [ Failure ]
 Bug(700530) fast/multicol/tall-content-in-inner-with-fixed-height.html [ Failure ]
 Bug(700530) compositing/geometry/abs-position-inside-opacity.html [ Failure ]
 Bug(700530) fast/css3-text/css3-text-decoration/text-underline-position/text-underline-position-cjk.html [ Failure ]
-
-# These are failing due to compositing isolation failures in SVG
-# (likely missing code to account for CompositingRecorder).
-crbug.com/665259 svg/as-background-image/svg-as-background-5.html [ Failure ]
-crbug.com/665259 svg/as-background-image/svg-as-background-6.html [ Failure ]