Revert of Relanding this with font test fixes for gdi.

Revert of Relanding this with font test fixes for gdi. (patchset #7 id:120001 of https://codereview.chromium.org/853553002/)

Reason for revert:
still fails on XP

https://build.chromium.org/p/chromium.win/builders/XP%20Tests%20%281%29/builds/34996/steps/gfx_unittests/logs/DeriveFontWithHeight

Original issue's description:
> Relanding this with font test fixes for gdi.
>
> Get all font unittests running with DirectWrite on Windows 7+
>
> Fixes as per below:-
> 1. Remove the addition of the fLeading value when calculating the height for the font
>    with DirectWrite. fAscent + fDescent is the height of the font and adding the fLeading
>    value to it returns the spacing between lines which is not what we are looking for.
>
> 2. The FontListTest.Fonts_GetHeight_GetBaseline unittest has a condition which basically validates
>    whether the difference between the font height and the baseline is different for Arial and Symbol
>    fonts. This fails for DirectWrite and fails for GDI with font sizes like 50, etc. Replaced this check
>    with a check for the font heights are different.
>
> 3. Reworked the PlatformFontWinTest.DeriveFontWithHeight test to ensure it passes for DirectWrite and GDI.
>
> 4. Ensure that the PlatformFontWin::DeriveFontWithHeight function honors the minimum font size constraint
>    in all cases.
>
> BUG=442010
> R=msw
>
> Committed: https://crrev.com/3e05f41653bf36cce40718d8295ce2293218dab6
> Cr-Commit-Position: refs/heads/master@{#311388}

TBR=msw@chromium.org,ananta@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=442010
Committed: https://crrev.com/ab0d2cafe050202ea69bbf4dfd9a6f6a39584a44
Cr-Commit-Position: refs/heads/master@{#311424}

[jochen (gone - plz use gerrit), 2015-01-14 07:47:07]

Created Revert of Relanding this with font test fixes for gdi.

[commit-bot: I haz the power, 2015-01-14 07:47:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/847283003/1

[commit-bot: I haz the power, 2015-01-14 07:48:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-14 07:50:36]

Patchset 1 (id:??) landed as
https://crrev.com/ab0d2cafe050202ea69bbf4dfd9a6f6a39584a44
Cr-Commit-Position: refs/heads/master@{#311424}