Mark device-emulation-scale-only as failing on Mac

TBR=dgozman
BUG=356743

Review URL: https://codereview.chromium.org/212883003

git-svn-id: svn://svn.chromium.org/blink/trunk@170076 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -429,6 +429,8 @@ crbug.com/290411 [ Linux ] fast/text/sub-pixel/text-scaling-pixel.html [ Pass Fa
 
 crbug.com/334269 [ Mac ] fast/text/font-variant-ligatures.html [ ImageOnlyFailure ]
 
+crbug.com/356743 [ Mac ] inspector/device-emulation/device-emulation-scale-only.html [ Pass Failure ]
+
 # Switching to content shell failures
 crbug.com/231866 [ Lion ] fast/backgrounds/animated-gif-as-background.html [ Pass ImageOnlyFailure ]
 crbug.com/235110 [ Mac ] virtual/softwarecompositing [ Skip ]