[LayoutNG] Remove pass expectation for combining-marks-position.html

This test:
  fast/text/international/combining-marks-position.html
passes on Windows but fails on Linux and Mac. It renders Arabic
using LinLibertine, which is a Latin font, and that falls back
to system fallback.

LayoutNG added an expectation to pass at one point where it passed,
probably due to some errors. Now it fails as in the current layout
engine, which is expected.

TBR=drott@chromium.org, atotic@chromium.org, bashi@chromium.org
NOTRY=true

Bug: 636993
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I93b33c96ed1ead3baa1ec535f86610425ae1fd4c
Reviewed-on: https://chromium-review.googlesource.com/992712
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547744}

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

@@ -1618,7 +1618,6 @@ crbug.com/591099 fast/text/find-kana.html [ Timeout ]
 crbug.com/591099 fast/text/hide-atomic-inlines-after-ellipsis.html [ Failure ]
 crbug.com/591099 fast/text/international/bidi-linebreak-002.html [ Failure ]
 crbug.com/591099 fast/text/international/bidi-linebreak-003.html [ Failure ]
-crbug.com/591099 fast/text/international/combining-marks-position.html [ Failure ]
 crbug.com/714962 fast/text/international/hindi-whitespace.html [ Failure ]
 crbug.com/796943 fast/text/international/shape-across-elements-simple.html [ Pass ]
 crbug.com/591099 fast/text/international/text-combine-image-test.html [ Failure ]

third_party/WebKit/LayoutTests/flag-specific/enable-blink-features=LayoutNG/fast/text/international/combining-marks-position-expected.txt

-This test ensures that combining marks apper over the previous (or next) character by comparing the length of words (one has marks, and the other doesn't have marks).
-
-test проверка
-tèst провѐрка
-خانه
-خانهٔ
-PASS. The length of targets and references are the same.
-