WIP: prefer using EphemeralRange for SpellChecker.

Source/core/editing/InputMethodController.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 341 matching lines @@
     return EphemeralRange(Position(m_compositionNode.get(), start), Position(m_compositionNode.get(), end));
 }
 
 PassRefPtrWillBeRawPtr<Range> InputMethodController::compositionRange() const
 {
     return createRange(compositionEphemeralRange());
 }
 
 PlainTextRange InputMethodController::getSelectionOffsets() const
 {
-    RefPtrWillBeRawPtr<Range> range = firstRangeOf(frame().selection().selection());
-    if (!range)
+    EphemeralRange range = firstEphemeralRangeOf(frame().selection().selection());

[yosin_UTC9, 2015/09/10 06:37:03]

nit: |const EphmeralRange|

+    if (range.isNull())
         return PlainTextRange();
     ContainerNode* editable = frame().selection().rootEditableElementOrTreeScopeRootNode();
     ASSERT(editable);
-    return PlainTextRange::create(*editable, *range.get());
+    return PlainTextRange::create(*editable, range);
 }
 
 bool InputMethodController::setSelectionOffsets(const PlainTextRange& selectionOffsets)
 {
     if (selectionOffsets.isNull())
         return false;
     Element* rootEditableElement = frame().selection().rootEditableElement();
     if (!rootEditableElement)
         return false;
 
@@ skipping 41 matching lines @@
     TypingCommand::deleteSelection(*frame().document());
 }
 
 DEFINE_TRACE(InputMethodController)
 {
     visitor->trace(m_frame);
     visitor->trace(m_compositionNode);
 }
 
 } // namespace blink