Make Editor::tidyUpHTMLStructure() handles BODY element correctly

third_party/WebKit/Source/core/editing/Editor.cpp

Index: third_party/WebKit/Source/core/editing/Editor.cpp
diff --git a/third_party/WebKit/Source/core/editing/Editor.cpp b/third_party/WebKit/Source/core/editing/Editor.cpp
index 1ea22e3482a0af9a86941fb6fce93e5279d3f7ab..6442a0edea0c8b807bd04a65aa84be8f16b92fee 100644
--- a/third_party/WebKit/Source/core/editing/Editor.cpp
+++ b/third_party/WebKit/Source/core/editing/Editor.cpp
@@ -1361,7 +1361,7 @@ void Editor::tidyUpHTMLStructure(Document& document)
         body = existingBody.release();
     else
         body = HTMLBodyElement::create(document);
-    if (document.documentElement())
+    if (document.documentElement() && body != document.documentElement())
         body->appendChild(document.documentElement());
     root->appendChild(body.release());
     ASSERT(!document.documentElement());