Prepare to enable RenderTextHarfBuzz by default

ui/gfx/render_text.cc

Index: ui/gfx/render_text.cc
diff --git a/ui/gfx/render_text.cc b/ui/gfx/render_text.cc
index 22a8f31ad091820d87d3549a1e1d8a9435da35a3..24b6a418d6e3da44386f871eeaac85ff96c521f9 100644
--- a/ui/gfx/render_text.cc
+++ b/ui/gfx/render_text.cc
@@ -426,8 +426,8 @@ RenderText* RenderText::CreateInstance() {
   // Use the more complete HarfBuzz implementation for Views controls on Mac.
   return new RenderTextHarfBuzz;
 #else
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableHarfBuzzRenderText)) {
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableHarfBuzzRenderText)) {
     return new RenderTextHarfBuzz;
   }
   return CreateNativeInstance();