Fixes gn-check errors with enable_plugins=false.

content/browser/renderer_host/font_utils_linux.cc

Index: content/browser/renderer_host/font_utils_linux.cc
diff --git a/content/browser/renderer_host/font_utils_linux.cc b/content/browser/renderer_host/font_utils_linux.cc
index 245475f665032d6560ba697e7de384c68dc8785d..f32f6a1b88639795a21a9acb6f1b81aba5657f8f 100644
--- a/content/browser/renderer_host/font_utils_linux.cc
+++ b/content/browser/renderer_host/font_utils_linux.cc
@@ -12,8 +12,11 @@
 #include <string>
 
 #include "base/posix/eintr_wrapper.h"
-#include "ppapi/c/private/pp_private_font_charset.h"
-#include "ppapi/c/trusted/ppb_browser_font_trusted.h"
+
+// TODO(crbug/685022): Guard the inclusion of ppapi headers with
+// BUILDFLAG(ENABLE_PLUGINS).
+#include "ppapi/c/private/pp_private_font_charset.h"  // nogncheck
+#include "ppapi/c/trusted/ppb_browser_font_trusted.h"  // nogncheck
 
 namespace {