Add getDefaultFontSize and setDefaultFontSize to Font Settings Extension API.

chrome/browser/extensions/extension_function_registry.cc

Index: chrome/browser/extensions/extension_function_registry.cc
diff --git a/chrome/browser/extensions/extension_function_registry.cc b/chrome/browser/extensions/extension_function_registry.cc
index 3b1d0254bf1a1a5d23bd8c06243c0622bb740eea..d75d28abbf83ac1e0425754182bf63ee76b7fca8 100644
--- a/chrome/browser/extensions/extension_function_registry.cc
+++ b/chrome/browser/extensions/extension_function_registry.cc
@@ -415,6 +415,8 @@ void ExtensionFunctionRegistry::ResetFunctions() {
   RegisterFunction<GetFontListFunction>();
   RegisterFunction<GetFontNameFunction>();
   RegisterFunction<SetFontNameFunction>();
+  RegisterFunction<GetDefaultFontSizeFunction>();
+  RegisterFunction<SetDefaultFontSizeFunction>();
 
   // ChromeAuth settings.
   RegisterFunction<SetCloudPrintCredentialsFunction>();