Make calls to AtomicString(const String&) explicit in editing/

Source/core/editing/EditorCommand.cpp

Index: Source/core/editing/EditorCommand.cpp
diff --git a/Source/core/editing/EditorCommand.cpp b/Source/core/editing/EditorCommand.cpp
index 8c6291af1e013a5190945fdca9431aaa2e9e45aa..b98f3da95e33c50f6c6ba87cf90b4f5502a15cc9 100644
--- a/Source/core/editing/EditorCommand.cpp
+++ b/Source/core/editing/EditorCommand.cpp
@@ -489,7 +489,7 @@ static bool executeInsertHorizontalRule(Frame& frame, Event*, EditorCommandSourc
     ASSERT(frame.document());
     RefPtr<HTMLHRElement> rule = HTMLHRElement::create(*frame.document());
     if (!value.isEmpty())
-        rule->setIdAttribute(value);
+        rule->setIdAttribute(AtomicString(value));
     return executeInsertNode(frame, rule.release());
 }