Allow objects without scrollbars to be scrollable

Source/core/platform/chromium/support/WebScrollbarThemeClientImpl.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
@@ skipping 158 matching lines @@
 int WebScrollbarThemeClientImpl::maximum() const
 {
     return m_scrollbar->maximum();
 }
 
 WebCore::ScrollbarControlSize WebScrollbarThemeClientImpl::controlSize() const
 {
     return static_cast<WebCore::ScrollbarControlSize>(m_scrollbar->controlSize());
 }
 
-int WebScrollbarThemeClientImpl::lineStep() const
-{
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
-int WebScrollbarThemeClientImpl::pageStep() const
-{
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
 WebCore::ScrollbarPart WebScrollbarThemeClientImpl::pressedPart() const
 {
     return static_cast<WebCore::ScrollbarPart>(m_scrollbar->pressedPart());
 }
 
 WebCore::ScrollbarPart WebScrollbarThemeClientImpl::hoveredPart() const
 {
     return static_cast<WebCore::ScrollbarPart>(m_scrollbar->hoveredPart());
 }
 
@@ skipping 21 matching lines @@
 {
     return m_scrollbar->isAlphaLocked();
 }
 
 void WebScrollbarThemeClientImpl::setIsAlphaLocked(bool flag)
 {
     m_scrollbar->setIsAlphaLocked(flag);
 }
 
 } // namespace WebKit