Reset Default Font on exit from PlatformFontLinuxTest.

ui/gfx/platform_font_linux_unittest.cc

Index: ui/gfx/platform_font_linux_unittest.cc
diff --git a/ui/gfx/platform_font_linux_unittest.cc b/ui/gfx/platform_font_linux_unittest.cc
index cc304f20ed6c18a89a52db7be7716fa823b3f4ac..f677ba4dda9af591c8c61af538296b197014c98e 100644
--- a/ui/gfx/platform_font_linux_unittest.cc
+++ b/ui/gfx/platform_font_linux_unittest.cc
@@ -70,6 +70,7 @@ class PlatformFontLinuxTest : public testing::Test {
   ~PlatformFontLinuxTest() override {
     LinuxFontDelegate::SetInstance(
         const_cast<LinuxFontDelegate*>(original_font_delegate_));
+    PlatformFontLinux::ReloadDefaultFont();
     TearDownFontconfig();
   }