ValidationBubbleInRenderer: Enable pixel tests

Bug: 739091
Change-Id: Ifbc99e569813dfc2c2ae674beee3e1ea0c062666
TBR: keishi@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/569838
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486522}

third_party/WebKit/LayoutTests/TestExpectations

@@ -821,14 +821,6 @@ crbug.com/734762 inspector-protocol/accessibility/accessibility-nameSources-inpu
 
 crbug.com/487281 [ Mac ] fast/forms/select/menulist-narrow-width.html [ Failure ]
 
-# Mark as Failure until the development is done.
-crbug.com/739091 fast/forms/validation-bubble-appearance-edge.html [ Failure ]
-crbug.com/739091 fast/forms/validation-bubble-appearance-iframe.html [ Failure ]
-crbug.com/739091 fast/forms/validation-bubble-appearance-rtl-ui.html [ Failure ]
-crbug.com/739091 virtual/scalefactor150/fast/hidpi/static/validation-bubble-appearance-hidpi.html [ Failure ]
-crbug.com/739091 virtual/scalefactor200/fast/hidpi/static/validation-bubble-appearance-hidpi.html [ Failure ]
-crbug.com/739091 virtual/scalefactor200withzoom/fast/hidpi/static/validation-bubble-appearance-hidpi.html [ Failure ]
-
 crbug.com/543110 [ Mac ] fast/text/international/text-shaping-arabic.html [ Failure ]
 
 crbug.com/731731 inspector-protocol/layers/paint-profiler-load-empty.js [ Failure Pass ]