Fix content shell layout test failure related to Fontconfig

ui/gfx/test/fontconfig_util_linux.cc

Index: ui/gfx/test/fontconfig_util_linux.cc
diff --git a/ui/gfx/test/fontconfig_util_linux.cc b/ui/gfx/test/fontconfig_util_linux.cc
index 6f2da0be9c94017b8ad1330d9f53927b35e3ecd2..fd1ac563fa0ea142384a750f0f9ab00c91873761 100644
--- a/ui/gfx/test/fontconfig_util_linux.cc
+++ b/ui/gfx/test/fontconfig_util_linux.cc
@@ -72,9 +72,11 @@ void SetUpFontconfig() {
   // - FcConfigReference() increments a config's refcount.
   // - FcConfigDestroy() decrements a config's refcount, deallocating the
   //   config when the count reaches 0.
-  // - FcConfigSetCurrent() calls FcConfigDestroy() on the old config, but
-  //   interestingly does not call FcConfigReference() on the new config.
-  CHECK(FcConfigSetCurrent(FcConfigCreate()));
+  // - FcConfigSetCurrent() calls FcConfigDestroy() on the old config, and
+  //   calls FcConfigReference() on the new config.
+  FcConfig* config = FcConfigCreate();
+  FcConfigBuildFonts(config);
+  CHECK(FcConfigSetCurrent(config));

[Daniel Erat, 2016/06/27 23:40:43]

interesting.
https://www.freedesktop.org/software/fontconfig/fontconfig-devel/fcconfigsetc...
says "Implicitly calls FcConfigBuildFonts if necessary". this seems fine to me
if it fixes failures, though.

 }
 
 void TearDownFontconfig() {