Rename Document::ownerElement to localOwner and fix main frame checks.

third_party/WebKit/Source/core/dom/Document.h

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index e102c0b0955a2c01c4bc8865f61e7e256c8929be..b2ceec1ae15f9dfbfdf1bfa61b44cd90c2a8f490 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -691,9 +691,9 @@ public:
     void updateViewportDescription();
     void processReferrerPolicy(const String& policy);
 
-    // Returns the owning element in the parent document.
-    // Returns nullptr if this is the top level document.
-    HTMLFrameOwnerElement* ownerElement() const;
+    // Returns the owning element in the parent document. Returns nullptr if
+    // this is the top level document or the owner is remote.
+    HTMLFrameOwnerElement* localOwnerElement() const;
 
     // Returns true if this document belongs to a frame that the parent document
     // made invisible (for instance by setting as style display:none).