Revert of Add PaintOptimizations feature to control subsequence caching and empty phase skipping

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 5e28c3f52aca23b5c2eaf86e58803b7302c1285f..0bea9890f9a54c88426e8a8b7da65a31539485ee 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -88,10 +88,6 @@ const base::Feature kOptimizeLoadingIPCForSmallResources{
 const base::Feature kOriginTrials{"OriginTrials",
                                   base::FEATURE_ENABLED_BY_DEFAULT};
 
-// Paint optimizations including subsequence caching and empty phase skipping.
-const base::Feature kPaintOptimizations{"PaintOptimizations",
-                                        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};