Remove reliance on remaining MS TTF core fonts

This CL removes usage of the last remaining system fonts.  With this, only GCS
fonts are used.

The two fonts removed are Comic Sans and Impact, which used to be the default
font families for cursive and fantasy, respectively.  Since there's no suitable
replacement for these fonts with an open license, fallback on the default font
(DejaVu Sans).

R=eae
TBR=dpranke
BUG=787020

Change-Id: Iee177b18e027370ba8181cb70edcfb3b3fdfcae3
Reviewed-on: https://chromium-review.googlesource.com/1010412
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552743}

CrOS-Libchrome-Original-Commit: 7d4a3da52ce50e2a8ede87cfdaa89f525b3b7105
diff --git a/base/test/fontconfig_util_linux.cc b/base/test/fontconfig_util_linux.cc
index eba4993..8bd7c92 100644
--- a/base/test/fontconfig_util_linux.cc
+++ b/base/test/fontconfig_util_linux.cc
@@ -29,30 +29,6 @@
   <!-- GCS-synced fonts. -->
   <dir>$2</dir>
 
-  <!-- System fonts.  TODO(thomasanderson): Remove these. -->
-  <dir>/usr/share/fonts/truetype/msttcorefonts</dir>
-
-  <!-- The rejectfont element is used to exclude entire directories.  Then
-       acceptfont can be used to add specific fonts back.  Use this feature to
-       whitelist specific fonts from msttcorefonts while we transition to using
-       our own fonts. -->
-  <selectfont>
-    <rejectfont>
-      <glob>/usr/share/fonts/truetype/msttcorefonts/*</glob>
-    </rejectfont>
-
-    <!-- Do not add more fonts to this list. -->
-    <acceptfont>
-      <glob>/usr/share/fonts/truetype/msttcorefonts/Comic_Sans_MS.ttf</glob>
-    </acceptfont>
-    <acceptfont>
-      <glob>/usr/share/fonts/truetype/msttcorefonts/Comic_Sans_MS_Bold.ttf</glob>
-    </acceptfont>
-    <acceptfont>
-      <glob>/usr/share/fonts/truetype/msttcorefonts/Impact.ttf</glob>
-    </acceptfont>
-  </selectfont>
-
   <!-- Default properties. -->
   <match target="font">
     <edit name="embeddedbitmap" mode="append_last">