Refactoring code in highestEditableRoot to avoid a redundant call to rendererIsEditable

Source/core/editing/htmlediting.cpp

Index: Source/core/editing/htmlediting.cpp
diff --git a/Source/core/editing/htmlediting.cpp b/Source/core/editing/htmlediting.cpp
index 8a7e6489cb870b7571f086a2a1c4f2130624c999..9fd351541d5d6177076b88a386fb4ffe65f03b34 100644
--- a/Source/core/editing/htmlediting.cpp
+++ b/Source/core/editing/htmlediting.cpp
@@ -116,7 +116,10 @@ Node* highestEditableRoot(const Position& position, EditableType editableType)
     if (!highestRoot)
         return 0;
 
-    node = highestRoot;
+    if (highestRoot->hasTagName(bodyTag))
+        return highestRoot;
+
+    node = highestRoot->parentNode();
     while (node) {
         if (node->rendererIsEditable(editableType))
             highestRoot = node;