XMLHttpRequest: Don't use nullness of isolatedWorldSecurityOrigin to determine whether or not it's …

third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h

Index: third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h
diff --git a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h
index 0ee3744aa0a4946ae24edae987df70454d47dd46..6ce72dc64cf16dd5687346310d4ae2c3e0dd4d40 100644
--- a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h
+++ b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h
@@ -171,9 +171,15 @@ class XMLHttpRequest final : public XMLHttpRequestEventTarget,
 
  private:
   class BlobLoader;
-  XMLHttpRequest(ExecutionContext*, PassRefPtr<SecurityOrigin>);
+  XMLHttpRequest(ExecutionContext*,
+                 bool isIsolatedWorld,
+                 PassRefPtr<SecurityOrigin>);
 
   Document* document() const;
+
+  // Returns the SecurityOrigin of the isolated world if the XMLHttpRequest was
+  // created in an isolated world. Otherwise, returns the SecurityOrigin of the
+  // execution context.
   SecurityOrigin* getSecurityOrigin() const;
 
   void didSendData(unsigned long long bytesSent,
@@ -317,6 +323,10 @@ class XMLHttpRequest final : public XMLHttpRequestEventTarget,
   // An enum corresponding to the allowed string values for the responseType
   // attribute.
   ResponseTypeCode m_responseTypeCode;
+
+  // Set to true if the XMLHttpRequest was created in an isolated world.
+  bool m_isIsolatedWorld;
+  // Stores the SecurityOrigin associated with the isolated world if any.
   RefPtr<SecurityOrigin> m_isolatedWorldSecurityOrigin;
 
   // This blob loader will be used if |m_downloadingToFile| is true and