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This reverts commit 143d21fd.

Reason for revert: Deterministically fails gfx_unittests on Mac 10.12
First failure: https://ci.chromium.org/p/chromium/builders/ci/Mac10.12%20Tests/31106

Original change's description:
> Remove ignorable codepoints for FontFallback
> 
> Default ignorable codepoints should not be considered for
> choosing a fallback font.
> 
> see:
>  http://www.unicode.org/L2/L2002/02368-default-ignorable.pdf
> """
>   Default-ignorable codepoints are those that should be ignored
>   by default in rendering (unless explicitly supported). They have
>   no visible glyph or advance width in and of themselves, although
>   they may affect the display, positioning, or adornment of
>   adjacent or surrounding characters.
> """
> 
> The API used to determine fallback fonts on Mac is
> CTFontCreateForString(...)
>   1) This API can returns .LastResort for an unknown text.
>      We observed this behavior with Emoji (e.g. regional flags).
>    see:
>      https://unicode.org/policies/lastresortfont_eula.html
> 
>   2) The API is not able to match default ignorable codepoints
>      like ZWJ and NZWJ. GetFallbackFont(...) was failing when
>      an ignorable codepoints is present and the expensive
>      GetFallbackFonts(...) is used instead.
> 
> 
> Bug: 1036652
> Change-Id: I12a81a0130b072f662547abd0d82f73c24a7b20d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995501
> Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
> Reviewed-by: Robert Liao <robliao@chromium.org>
> Reviewed-by: Dominik Röttsches <drott@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#732133}

TBR=robliao@chromium.org,drott@chromium.org,etienneb@chromium.org

Change-Id: I5c9fa4078a1519fc044536befd5d8a6ed0ea2604
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1036652
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2004168Reviewed-by: Meredith Lane <meredithl@chromium.org>
Commit-Queue: Meredith Lane <meredithl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732252}