Move windows specific isFixedPitch to FontPlatformData

Move windows specific isFixedPitch to FontPlatformData

Move windows specific isFixedPitch logic from SimpleFontData to
FontPlatformDataChromiumWin. This mirrors the Skia API and allows
for better abstraction.

Also use SkTypeface::isFixedPitch instead of using GDI TEXTMETRIC
directly if GDI_FONTS_ON_WINDOWS is disabled.

BUG=250859
TEST=No new tests, covered by existing tests.
R=reed@google.com, senorblanco@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=152583

[eae, 2013-06-17 17:26:55]

Using SkTypface::isFixedPitch instead of TEXTMETRIC::tmPitchAndFamily seems to
work just fine even though some of the comments makes it seem like
m_treatAsFixedPitch should be interpreted as "has fixed advance".

We could always revert that change later if it turns out to be problematic.

[reed1, 2013-06-17 19:43:31]

lgtm

[commit-bot: I haz the power, 2013-06-17 20:25:15]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eae@chromium.org/17080004/1

[commit-bot: I haz the power, 2013-06-17 20:31:59]

Change committed as 152583