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This CL is adding a test to cover:
  Font::Font(...)
  PlatformFont::CreateDefault(...)

The default constructor was not covered by any unittests. This was found
while doing the migration from PlatformFontWin to PlatformFontSkia.

This CL is also restricting the use Font::platform_font(...) to windows.
This function will be removed as soon as the migration is completed.

R=robliao@chromium.org, asvitkine@chromium.org
CC=benck@google.com

Bug: 944227
Change-Id: Ib9a77c412966c3ebff81dfbf5340a762f69dc6e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1642816
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666373}