Move implementation of WebFrameImpl::executeCommand to Editor

Source/core/editing/Editor.h

Index: Source/core/editing/Editor.h
diff --git a/Source/core/editing/Editor.h b/Source/core/editing/Editor.h
index 72d5ff460ae26b0549f6fa5bd2399fa817ec3f61..a7e597839998098ceb8f5cab20eeafc8fdb6ca73 100644
--- a/Source/core/editing/Editor.h
+++ b/Source/core/editing/Editor.h
@@ -155,6 +155,9 @@ public:
     Command command(const String& commandName); // Command source is CommandFromMenuOrKeyBinding.
     Command command(const String& commandName, EditorCommandSource);
 
+    bool executeCommand(const String&);

[tkent, 2014/06/30 00:22:02]

We should have a comment that these functions are NOT implementations of
document.execCommand().

[yosin_UTC9, 2014/06/30 01:22:08]

Done.

+    bool executeCommand(const String& commandName, const String& value);
+
     bool insertText(const String&, Event* triggeringEvent);
     bool insertTextWithoutSendingTextEvent(const String&, bool selectInsertedText, TextEvent* triggeringEvent);
     bool insertLineBreak();