Allow default font size changing on Linux.

chrome/browser/renderer_preferences_util.cc

Index: chrome/browser/renderer_preferences_util.cc
diff --git a/chrome/browser/renderer_preferences_util.cc b/chrome/browser/renderer_preferences_util.cc
index 519e63b9a4c94a254092bb2e451aac64d8c255ed..e19050c8960436fc381bec6ee5b832a79e58a07e 100644
--- a/chrome/browser/renderer_preferences_util.cc
+++ b/chrome/browser/renderer_preferences_util.cc
@@ -13,6 +13,7 @@
 
 #if defined(OS_LINUX) || defined(OS_ANDROID)
 #include "ui/gfx/font_render_params.h"
+#include "ui/gfx/platform_font.h"
 #endif
 
 #if defined(TOOLKIT_VIEWS)
@@ -82,6 +83,10 @@ void UpdateFromSystemSettings(
   prefs->use_autohinter = params.autohinter;
   prefs->use_bitmaps = params.use_bitmaps;
   prefs->subpixel_rendering = params.subpixel_rendering;
+
+  scoped_refptr<gfx::PlatformFont> default_font(
+      gfx::PlatformFont::CreateDefault());
+  prefs->default_font_size = default_font->GetFontSize();
 #endif
 
 #if !defined(OS_MACOSX)