Newline characters in pasted text are not counted correctly for textarea[maxlength].

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef HTMLTextAreaElement_h
 #define HTMLTextAreaElement_h
 
+#include "base/gtest_prod_util.h"
 #include "core/CoreExport.h"
 #include "core/html/HTMLTextFormControlElement.h"
 
 namespace blink {
 
 class BeforeTextInsertedEvent;
 class ExceptionState;
 
 class CORE_EXPORT HTMLTextAreaElement final : public HTMLTextFormControlElement {
     DEFINE_WRAPPERTYPEINFO();
@@ skipping 22 matching lines @@
     String validationMessage() const override;
     bool valueMissing() const override;
     bool tooLong() const override;
     bool tooShort() const override;
     bool isValidValue(const String&) const;
 
     void setCols(unsigned);
     void setRows(unsigned);
 
 private:
+    FRIEND_TEST_ALL_PREFIXES(HTMLTextAreaElementTest, SanitizeUserInputValue);
     HTMLTextAreaElement(Document&, HTMLFormElement*);
 
     enum WrapMethod { NoWrap, SoftWrap, HardWrap };
     enum SetValueCommonOption {
         NotSetSelection,
         SetSeletion
     };
 
     void didAddUserAgentShadowRoot(ShadowRoot&) override;
     // FIXME: Author shadows should be allowed
@@ skipping 65 matching lines @@
     mutable String m_value;
     mutable bool m_isDirty;
     bool m_valueIsUpToDate;
     unsigned m_isPlaceholderVisible : 1;
     String m_suggestedValue;
 };
 
 } // namespace blink
 
 #endif // HTMLTextAreaElement_h