Refactoring: Simplify DocumentWriter by reorganizing its lifetime.

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 3518ccb663a2128a00404d2c409706cc62b5812a..993203917604244749d8cb602f15a5d1b3a8ea8f 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -1948,6 +1948,16 @@ String Internals::getImageSourceURL(Element* element, ExceptionCode& ec)
     return element->imageSourceURL();
 }
 
+String Internals::baseURL(Document* document, ExceptionCode& ec)
+{
+    if (!document) {
+        ec = INVALID_ACCESS_ERR;
+        return String();
+    }
+
+    return document->baseURL().string();
+}
+
 bool Internals::isSelectPopupVisible(Node* node)
 {
     if (!isHTMLSelectElement(node))