DirectWrite doesn't support Bitmap/Vector fonts and Adobe Type 1 fonts.

DirectWrite doesn't support Bitmap/Vector fonts and Adobe Type 1 fonts.
With this CL, we ignore font files with .fon/.pfm/.pfb extensions while building our custom font collection.
MSDN Ref: http://goo.gl/TfCOA

BUG=439571
R=cpu@chromium.org,scottmg@chromium.org

Committed: https://crrev.com/b8dabc6ecd380bd3f64a374e9c02f077916d44d8
Cr-Commit-Position: refs/heads/master@{#322470}

[scottmg, 2015-03-26 01:26:54]

lgtm

https://codereview.chromium.org/1034813003/diff/1/content/common/dwrite_font_...
File content/common/dwrite_font_platform_win.cc (right):

https://codereview.chromium.org/1034813003/diff/1/content/common/dwrite_font_...
content/common/dwrite_font_platform_win.cc:750: FILE_PATH_LITERAL(".FON"),  //
Bitmap or vector
huh! I didn't know .fon had a vector format too.

[cpu_(ooo_6.6-7.5), 2015-03-26 20:10:56]

lgtm

[cpu_(ooo_6.6-7.5), 2015-03-26 20:10:59]

The CQ bit was checked by cpu@chromium.org

[commit-bot: I haz the power, 2015-03-26 20:11:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1034813003/1

[commit-bot: I haz the power, 2015-03-26 21:13:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-26 21:15:26]

Patchset 1 (id:??) landed as
https://crrev.com/b8dabc6ecd380bd3f64a374e9c02f077916d44d8
Cr-Commit-Position: refs/heads/master@{#322470}