[LazyParseCSS] Ensure UseCounting has parity with strict parsing

third_party/WebKit/Source/core/css/StyleSheetContents.cpp

Index: third_party/WebKit/Source/core/css/StyleSheetContents.cpp
diff --git a/third_party/WebKit/Source/core/css/StyleSheetContents.cpp b/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
index be7d917df767513bc75e55fef728e24855593542..1403ca2372c1bee0095f3b9f4729b0a62146f8ee 100644
--- a/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
+++ b/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
@@ -491,6 +491,10 @@ Document* StyleSheetContents::singleOwnerDocument() const {
   return root->clientSingleOwnerDocument();
 }
 
+Document* StyleSheetContents::anyOwnerDocument() const {
+  return rootStyleSheet()->clientAnyOwnerDocument();
+}
+
 static bool childRulesHaveFailedOrCanceledSubresources(
     const HeapVector<Member<StyleRuleBase>>& rules) {
   for (unsigned i = 0; i < rules.size(); ++i) {
@@ -531,15 +535,18 @@ bool StyleSheetContents::hasFailedOrCanceledSubresources() const {
   return childRulesHaveFailedOrCanceledSubresources(m_childRules);
 }
 
-Document* StyleSheetContents::clientSingleOwnerDocument() const {
-  if (!m_hasSingleOwnerDocument || clientSize() <= 0)
+Document* StyleSheetContents::clientAnyOwnerDocument() const {
+  if (clientSize() <= 0)
     return nullptr;
-
   if (m_loadingClients.size())
     return (*m_loadingClients.begin())->ownerDocument();
   return (*m_completedClients.begin())->ownerDocument();
 }
 
+Document* StyleSheetContents::clientSingleOwnerDocument() const {
+  return m_hasSingleOwnerDocument ? clientAnyOwnerDocument() : nullptr;
+}
+
 StyleSheetContents* StyleSheetContents::parentStyleSheet() const {
   return m_ownerRule ? m_ownerRule->parentStyleSheet() : nullptr;
 }