document.lastModified should consider user's local time zone

Source/core/html/shadow/DateTimeFieldElements.cpp

 /*
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 571 matching lines @@
 PassRefPtrWillBeRawPtr<DateTimeYearFieldElement> DateTimeYearFieldElement::create(Document& document, FieldOwner& fieldOwner, const DateTimeYearFieldElement::Parameters& parameters)
 {
     DEFINE_STATIC_LOCAL(AtomicString, yearPsuedoId, ("-webkit-datetime-edit-year-field", AtomicString::ConstructFromLiteral));
     RefPtrWillBeRawPtr<DateTimeYearFieldElement> field = adoptRefWillBeNoop(new DateTimeYearFieldElement(document, fieldOwner, parameters));
     field->initialize(yearPsuedoId, queryString(WebLocalizedString::AXYearFieldText));
     return field.release();
 }
 
 static int currentFullYear()
 {
-    double current = currentTimeMS();
-    double utcOffset = calculateUTCOffset();
-    double dstOffset = calculateDSTOffset(current, utcOffset);
-    int offset = static_cast<int>((utcOffset + dstOffset) / msPerMinute);
-    current += offset * msPerMinute;
-
+    double current = convertToLocalTime(currentTimeMS());
     DateComponents date;
     date.setMillisecondsSinceEpochForMonth(current);

[tkent, 2014/07/28 00:40:26]

nit: 
date.setMillisecondsSinceEpochForMonth(convertToLocalTime(currentTimeMS()))

[kangil_, 2014/07/31 00:45:45]

Done.

     return date.fullYear();
 }
 
 int DateTimeYearFieldElement::defaultValueForStepDown() const
 {
     return m_maxIsSpecified ? DateTimeNumericFieldElement::defaultValueForStepDown() : currentFullYear();
 }
 
 int DateTimeYearFieldElement::defaultValueForStepUp() const
 {
@@ skipping 22 matching lines @@
         setValueAsInteger(value);
         return;
     }
 
     setEmptyValue();
 }
 
 } // namespace blink
 
 #endif