Reland of Make /deep/ as no-op and remove ::shadow in dynamic profile

third_party/WebKit/Source/core/css/parser/CSSSelectorParser.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSSelectorParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSSelectorParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSSelectorParser.cpp
index df48a8857ffeb417af21c52c59f72f23d4df8a2d..729f3c9cc010bed0ef9cd4ffa5d1a36ae985d450 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSSelectorParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSSelectorParser.cpp
@@ -442,7 +442,7 @@
 
   AtomicString value = token.Value().ToAtomicString().LowerASCII();
   bool has_arguments = token.GetType() == kFunctionToken;
-  selector->UpdatePseudoType(value, has_arguments);
+  selector->UpdatePseudoType(value, *context_, has_arguments);
 
   if (!RuntimeEnabledFeatures::cssSelectorsFocusWithinEnabled() &&
       selector->GetPseudoType() == CSSSelector::kPseudoFocusWithin)
@@ -582,7 +582,8 @@
       const CSSParserToken& slash = range.ConsumeIncludingWhitespace();
       if (slash.GetType() != kDelimiterToken || slash.Delimiter() != '/')
         failed_parsing_ = true;
-      return CSSSelector::kShadowDeep;
+      return context_->IsDynamicProfile() ? CSSSelector::kShadowDeepAsDescendant
+                                          : CSSSelector::kShadowDeep;
     }
 
     default: