linux: Avoid using unset Fontconfig properties.

ui/gfx/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 376 matching lines @@
       "test/ui_cocoa_test_helper.mm",
     ]
   }
   if (is_linux) {
     configs += [ "//build/config/linux:fontconfig" ]
   }
 }
 
 test("gfx_unittests") {
   sources = [
-    "font_render_params_linux_unittest.cc",
     "geometry/box_unittest.cc",
     "geometry/cubic_bezier_unittest.cc",
     "geometry/insets_unittest.cc",
     "geometry/matrix3_unittest.cc",
     "geometry/point_unittest.cc",
     "geometry/point3_unittest.cc",
     "geometry/quad_unittest.cc",
     "geometry/rect_unittest.cc",
     "geometry/safe_integer_conversions_unittest.cc",
     "geometry/size_unittest.cc",
     "geometry/vector2d_unittest.cc",
     "geometry/vector3d_unittest.cc",
     "range/range_unittest.cc",
     "test/run_all_unittests.cc",
   ]
 
   deps = [
     ":gfx",
     ":gfx_test_support",
     "//base",
     "//base/test:test_support",
     "//testing/gtest",
     "//ui/base",
     "//ui/gfx/geometry",
     "//ui/resources:ui_test_pak",
   ]
 
   if (use_pango) {
-    sources += [ "platform_font_pango_unittest.cc" ]
+    sources += [
+      "font_render_params_linux_unittest.cc",
+      "platform_font_pango_unittest.cc",
+    ]
     configs += [
       "//build/config/linux:pangocairo",
       "//build/config/linux:pangoft2",
     ]
   }
 }
 
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }