Use |FrameSelection::selectedText()| where possible.

third_party/WebKit/Source/core/html/HTMLTextAreaElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 289 matching lines @@
     if (currentLength + computeLengthForSubmission(event->text()) < unsignedMaxLength)
         return;
 
     // selectionLength represents the selection length of this text field to be
     // removed by this insertion.
     // If the text field has no focus, we don't need to take account of the
     // selection length. The selection is the source of text drag-and-drop in
     // that case, and nothing in the text field will be removed.
     unsigned selectionLength = 0;
     if (focused()) {
-        const EphemeralRange range = document().frame()->selection().selection().toNormalizedEphemeralRange();
-        selectionLength = computeLengthForSubmission(plainText(range));
+        selectionLength = computeLengthForSubmission(document().frame()->selection().selectedText());
     }
     ASSERT(currentLength >= selectionLength);
     unsigned baseLength = currentLength - selectionLength;
     unsigned appendableLength = unsignedMaxLength > baseLength ? unsignedMaxLength - baseLength : 0;
     event->setText(sanitizeUserInputValue(event->text(), appendableLength));
 }
 
 String HTMLTextAreaElement::sanitizeUserInputValue(const String& proposedValue, unsigned maxLength)
 {
     if (maxLength > 0 && U16_IS_LEAD(proposedValue[maxLength - 1]))
@@ skipping 325 matching lines @@
 
 void HTMLTextAreaElement::copyNonAttributePropertiesFromElement(const Element& source)
 {
     const HTMLTextAreaElement& sourceElement = static_cast<const HTMLTextAreaElement&>(source);
     setValueCommon(sourceElement.value(), DispatchNoEvent, SetSeletion);
     m_isDirty = sourceElement.m_isDirty;
     HTMLTextFormControlElement::copyNonAttributePropertiesFromElement(source);
 }
 
 } // namespace blink