[LayoutNG] Mark tests that fail due to off-by-one in vertical-lr.

TBR=kojii@chromium.org

Bug: 850504
Change-Id: I617a48c931a6acf3bb7ca560d59b1136eea59d44
Reviewed-on: https://chromium-review.googlesource.com/c/1346457Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610077}

third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-features=LayoutNG

@@ -295,8 +295,8 @@ crbug.com/899902 fast/text/ellipsis-with-self-painting-layer.html [ Pass ]
 crbug.com/796943 fast/text/international/shape-across-elements-simple.html [ Pass ]
 crbug.com/591099 fast/text/whitespace/018.html [ Failure ]
 crbug.com/591099 fast/writing-mode/auto-sizing-orthogonal-flows.html [ Failure ]
-crbug.com/714962 fast/writing-mode/background-vertical-lr.html [ Failure ]
-crbug.com/591099 fast/writing-mode/basic-vertical-line.html [ Failure ]
+crbug.com/850504 fast/writing-mode/background-vertical-lr.html [ Failure ]
+crbug.com/850504 fast/writing-mode/basic-vertical-line.html [ Failure ]
 crbug.com/591099 fast/writing-mode/fieldsets.html [ Failure ]
 crbug.com/591099 fast/writing-mode/percentage-height-orthogonal-writing-modes.html [ Failure ]
 crbug.com/591099 fast/writing-mode/table-percent-width-quirk.html [ Pass ]