Enable ParseHTMLOnMainThread on TOT

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index 0ed194494d772bc266116e5e6489112763c2618d..b4673583aaa1cb85da0f91b6107c9c88191a94eb 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -146,10 +146,6 @@ const base::Feature kOptimizeLoadingIPCForSmallResources{
 const base::Feature kOriginTrials{"OriginTrials",
                                   base::FEATURE_ENABLED_BY_DEFAULT};
 
-// Whether the lookahead parser in Blink runs on the main thread.
-const base::Feature kParseHTMLOnMainThread{"ParseHTMLOnMainThread",
-                                           base::FEATURE_DISABLED_BY_DEFAULT};
-
 // Whether document level event listeners should default 'passive' to true.
 const base::Feature kPassiveDocumentEventListeners{
     "PassiveDocumentEventListeners", base::FEATURE_ENABLED_BY_DEFAULT};