Refactor ElementShadow by separating v0 related features as ElementShadowV0

third_party/WebKit/Source/core/html/HTMLContentElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLContentElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLContentElement.cpp b/third_party/WebKit/Source/core/html/HTMLContentElement.cpp
index a16138ae2418c25e48d83df2c0b24ee2ede3dca6..ae5f8945648694942dd28f5485c959338b226ecc 100644
--- a/third_party/WebKit/Source/core/html/HTMLContentElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLContentElement.cpp
@@ -31,6 +31,7 @@
 #include "core/css/parser/CSSParser.h"
 #include "core/dom/QualifiedName.h"
 #include "core/dom/shadow/ElementShadow.h"
+#include "core/dom/shadow/ElementShadowV0.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
@@ -77,7 +78,7 @@ void HTMLContentElement::parseAttribute(const QualifiedName& name, const AtomicS
     if (name == selectAttr) {
         if (ShadowRoot* root = containingShadowRoot()) {
             if (!root->isV1() && root->owner())
-                root->owner()->willAffectSelector();
+                root->owner()->v0().willAffectSelector();
         }
         m_shouldParseSelect = true;
         m_select = value;