The start and end arguments should be unsigned long in setSelectionRange() function

Source/core/html/HTMLTextFormControlElement.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, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010, 2011 Google 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
@@ skipping 50 matching lines @@
 
     // The derived class should return true if placeholder processing is needed.
     virtual bool supportsPlaceholder() const = 0;
     String strippedPlaceholder() const;
     bool placeholderShouldBeVisible() const;
     HTMLElement* placeholderElement() const;
     void updatePlaceholderVisibility(bool);
 
     VisiblePosition visiblePositionForIndex(int) const;
     int indexForVisiblePosition(const VisiblePosition&) const;
-    int selectionStart() const;
-    int selectionEnd() const;
+    unsigned selectionStart() const;
+    unsigned selectionEnd() const;
     const AtomicString& selectionDirection() const;
     void setSelectionStart(int);
     void setSelectionEnd(int);
     void setSelectionDirection(const String&);
     void select(NeedToDispatchSelectEvent = DispatchSelectEvent);
     virtual void setRangeText(const String& replacement, ExceptionState&);
     virtual void setRangeText(const String& replacement, unsigned start, unsigned end, const String& selectionMode, ExceptionState&);
-    void setSelectionRange(int start, int end, const String& direction);
-    void setSelectionRange(int start, int end, TextFieldSelectionDirection = SelectionHasNoDirection, NeedToDispatchSelectEvent = DispatchSelectEvent, SelectionOption = ChangeSelection);
+    void setSelectionRange(unsigned start, unsigned end, const String& direction);
+    void setSelectionRange(unsigned start, unsigned end, TextFieldSelectionDirection = SelectionHasNoDirection, NeedToDispatchSelectEvent = DispatchSelectEvent, SelectionOption = ChangeSelection);
     PassRefPtrWillBeRawPtr<Range> selection() const;
 
     virtual bool supportsAutocapitalize() const = 0;
     virtual const AtomicString& defaultAutocapitalize() const = 0;
     const AtomicString& autocapitalize() const;
     void setAutocapitalize(const AtomicString&);
 
     void dispatchFormControlChangeEvent() final;
 
     virtual String value() const = 0;
@@ skipping 17 matching lines @@
     static Position startOfSentence(const Position&);
     static Position endOfSentence(const Position&);
 
 protected:
     HTMLTextFormControlElement(const QualifiedName&, Document&, HTMLFormElement*);
     bool isPlaceholderEmpty() const;
     virtual void updatePlaceholderText() = 0;
 
     void parseAttribute(const QualifiedName&, const AtomicString&) override;
 
-    void cacheSelection(int start, int end, TextFieldSelectionDirection direction)
+    void cacheSelection(unsigned start, unsigned end, TextFieldSelectionDirection direction)
     {
-        ASSERT(start >= 0);
         m_cachedSelectionStart = start;
         m_cachedSelectionEnd = end;
         m_cachedSelectionDirection = direction;
     }
 
     void restoreCachedSelection();
 
     void defaultEventHandler(Event*) override;
     virtual void subtreeHasChanged() = 0;
 
     void setLastChangeWasNotUserEdit() { m_lastChangeWasUserEdit = false; }
 
     String valueWithHardLineBreaks() const;
 
     virtual bool shouldDispatchFormControlChangeEvent(String&, String&);
     void copyNonAttributePropertiesFromElement(const Element&) override;
 
 private:
-    int computeSelectionStart() const;
-    int computeSelectionEnd() const;
+    unsigned computeSelectionStart() const;
+    unsigned computeSelectionEnd() const;
     TextFieldSelectionDirection computeSelectionDirection() const;
 
     void dispatchFocusEvent(Element* oldFocusedElement, WebFocusType, InputDevice* sourceDevice) final;
     void dispatchBlurEvent(Element* newFocusedElement, WebFocusType, InputDevice* sourceDevice) final;
     void scheduleSelectEvent();
 
     // Returns true if user-editable value is empty. Used to check placeholder visibility.
     virtual bool isEmptyValue() const = 0;
     // Returns true if suggested value is empty. Used to check placeholder visibility.
     virtual bool isEmptySuggestedValue() const { return true; }
     // Called in dispatchFocusEvent(), after placeholder process, before calling parent's dispatchFocusEvent().
     virtual void handleFocusEvent(Element* /* oldFocusedNode */, WebFocusType) { }
     // Called in dispatchBlurEvent(), after placeholder process, before calling parent's dispatchBlurEvent().
     virtual void handleBlurEvent() { }
 
     String m_textAsOfLastFormControlChangeEvent;
     bool m_lastChangeWasUserEdit;
 
-    int m_cachedSelectionStart;
-    int m_cachedSelectionEnd;
+    unsigned m_cachedSelectionStart;
+    unsigned m_cachedSelectionEnd;
     TextFieldSelectionDirection m_cachedSelectionDirection;
 };
 
 inline bool isHTMLTextFormControlElement(const Element& element)
 {
     return element.isTextFormControl();
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLTextFormControlElement);
 
 HTMLTextFormControlElement* enclosingTextFormControl(const Position&);
 HTMLTextFormControlElement* enclosingTextFormControl(Node*);
 
 } // namespace
 
 #endif