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

Review URL: https://codereview.chromium.org/853553002

Cr-Commit-Position: refs/heads/master@{#311388}

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