Do not enable RenderTextHarfBuzz by default

RenderTextHarfBuzz will be enabled by default in the future, when the relevant bugs are fixed.

BUG=321868
R=msw

Review URL: https://codereview.chromium.org/469083002

Cr-Commit-Position: refs/heads/master@{#289502}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289502 0039d316-1c4b-4281-b951-d872f2087c98

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::kDisableHarfBuzzRenderText)) {
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableHarfBuzzRenderText)) {
     return new RenderTextHarfBuzz;
   }
   return CreateNativeInstance();