gonna to disable for now.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/397750846bc5dee424981a8b1d678c5896ce1d80

commit 397750846bc5dee424981a8b1d678c5896ce1d80
Author: Shuotao Gao <stgao@chromium.org>
Date: Thu Mar 08 01:10:20 2018

Disable failing layout tests on "WebKit Mac10.11 (retina)"

TBR=penghuang@chromium.org

Bug:  819851 
Change-Id: I79a372df597d64d4a0d1e5294c4f961e79e2d9f9
Reviewed-on: https://chromium-review.googlesource.com/954288
Reviewed-by: Shuotao Gao <stgao@chromium.org>
Commit-Queue: Shuotao Gao <stgao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541671}
[modify] https://crrev.com/397750846bc5dee424981a8b1d678c5896ce1d80/third_party/WebKit/LayoutTests/TestExpectations

The tests just need a rebaseline. Caused by  bug 819701 .

I still can't rebaseline the two tests. The bot seems still using the wrong baselines under platform/mac directory instead of the correct baselines under platform/mac-retina.

They can't be rebaselined because of  issue 818558 .

(Changing the Blockedon accordingly)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f895c9b7d06f076579131afadcf1fcac2086615c

commit f895c9b7d06f076579131afadcf1fcac2086615c
Author: Robert Ma <robertma@chromium.org>
Date: Sat Mar 10 01:41:34 2018

Fix Mac Retina detection and reenable some previously disabled tests

Starting from 10.12, system_profiler no longer contains the line
"Retina: Yes" (or No), so we need to detect Retina by looking at the
Resolution field instead.

Besides, we now realize that our Retina bots are actually running 10.12
(despite their names saying 10.11, which will be fixed in other CLs),
so Retina is changed to fall back to Mac 10.12 instead of 10.11.

Lastly, rebaseline.

Bug:  818558 ,  819851 
Change-Id: Ie3ed6ef7d090590f411a1701b72be920498c9769
Reviewed-on: https://chromium-review.googlesource.com/957306
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542306}
[modify] https://crrev.com/f895c9b7d06f076579131afadcf1fcac2086615c/third_party/WebKit/LayoutTests/NeverFixTests
[modify] https://crrev.com/f895c9b7d06f076579131afadcf1fcac2086615c/third_party/WebKit/LayoutTests/TestExpectations
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[add] https://crrev.com/f895c9b7d06f076579131afadcf1fcac2086615c/third_party/WebKit/LayoutTests/platform/mac-retina/fast/text/selection/flexbox-selection-expected.png
[add] https://crrev.com/f895c9b7d06f076579131afadcf1fcac2086615c/third_party/WebKit/LayoutTests/platform/mac-retina/fast/text/selection/flexbox-selection-nested-expected.png
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[delete] https://crrev.com/470ff7ff522a1613d567a6aad3e66c1fb7aeb008/third_party/WebKit/LayoutTests/platform/mac-retina/fast/writing-mode/text-combine-various-fonts-expected.png
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[modify] https://crrev.com/f895c9b7d06f076579131afadcf1fcac2086615c/third_party/WebKit/LayoutTests/platform/mac-retina/virtual/prefer_compositing_to_lcd_text/compositing/overflow/update-widget-positions-on-nested-frames-and-scrollers-expected.png
[modify] https://crrev.com/f895c9b7d06f076579131afadcf1fcac2086615c/third_party/WebKit/Tools/Scripts/webkitpy/common/system/platform_info.py
[modify] https://crrev.com/f895c9b7d06f076579131afadcf1fcac2086615c/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/mac.py