Use optional default value syntax in Selection.idl

Source/core/editing/DOMSelection.cpp

 /*
  * Copyright (C) 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 200 matching lines @@
     RefPtrWillBeRawPtr<Range> range = Range::create(node->document());
     range->setStart(node, offset, exceptionState);
     if (exceptionState.hadException())
         return;
     range->setEnd(node, offset, exceptionState);
     if (exceptionState.hadException())
         return;
     m_frame->selection().setSelectedRange(range.get(), DOWNSTREAM, m_frame->selection().isDirectional() ? FrameSelection::Directional : FrameSelection::NonDirectional);
 }
 
-void DOMSelection::collapse(Node* node, ExceptionState& exceptionState)
-{
-    collapse(node, 0, exceptionState);
-}
-
 void DOMSelection::collapseToEnd(ExceptionState& exceptionState)
 {
     if (!m_frame)
         return;
 
     const VisibleSelection& selection = m_frame->selection().selection();
 
     if (selection.isNone()) {
         exceptionState.throwDOMException(InvalidStateError, "there is no selection.");
         return;
@@ skipping 115 matching lines @@
         return;
     }
 
     if (!isValidForPosition(node))
         return;
 
     // FIXME: Eliminate legacy editing positions
     m_frame->selection().setExtent(VisiblePosition(createLegacyEditingPosition(node, offset), DOWNSTREAM));
 }
 
-void DOMSelection::extend(Node* node, ExceptionState& exceptionState)
-{
-    // This default value implementation differs from the spec, which says |offset| is not optional.
-    // FIXME: Specify this default value in Selection.idl.
-    extend(node, 0, exceptionState);
-}
-
 PassRefPtrWillBeRawPtr<Range> DOMSelection::getRangeAt(int index, ExceptionState& exceptionState)
 {
     if (!m_frame)
         return nullptr;
 
     if (index < 0 || index >= rangeCount()) {
         exceptionState.throwDOMException(IndexSizeError, String::number(index) + " is not a valid index.");
         return nullptr;
     }
 
@@ skipping 182 matching lines @@
     return node->document() == m_frame->document();
 }
 
 void DOMSelection::addConsoleError(const String& message)
 {
     if (m_treeScope)
         m_treeScope->document().addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, message));
 }
 
 } // namespace blink