Mark fast/text/trailing-white-space-2.html failure on Mac10.10

Ran rebaseline-cl twice but this test doesn't stabilize only
on Mac10.10.

TBR=yukishiino@chromium.org
NOTRY=true

Bug: 1011453, 1010662
Change-Id: I147d1c81d3a5c4be0a36c173109cd25ddb67a22b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1843799Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703228}

third_party/blink/web_tests/TestExpectations

@@ -346,6 +346,8 @@ crbug.com/981719 external/wpt/css/css-ui/appearance-textfield-001.html [ Failure
 crbug.com/981719 [ Linux ] external/wpt/css/css-ui/webkit-appearance-textfield-001.html [ Failure ]
 crbug.com/981719 [ Win ] external/wpt/css/css-ui/webkit-appearance-textfield-001.html [ Failure ]
 
+crbug.com/1011453 [ Mac10.10 ] fast/text/trailing-white-space-2.html [ Failure ]
+
 # ====== Paint team owned tests to here ======
 
 crbug.com/922249 virtual/android/fullscreen/compositor-touch-hit-rects-fullscreen-video-controls.html [ Failure Pass ]