Remove a lot of dead Scrollbar methods.

sky/engine/platform/exported/WebScrollbarImpl.cpp

Index: sky/engine/platform/exported/WebScrollbarImpl.cpp
diff --git a/sky/engine/platform/exported/WebScrollbarImpl.cpp b/sky/engine/platform/exported/WebScrollbarImpl.cpp
index f9b31355ea919b669bcdb8945861d7e61847ca51..031cff347384a968f973873b8333e01e03411576 100644
--- a/sky/engine/platform/exported/WebScrollbarImpl.cpp
+++ b/sky/engine/platform/exported/WebScrollbarImpl.cpp
@@ -71,11 +71,6 @@ int WebScrollbarImpl::totalSize() const
     return m_scrollbar->totalSize();
 }
 
-bool WebScrollbarImpl::isScrollViewScrollbar() const
-{
-    return m_scrollbar->isScrollViewScrollbar();
-}
-
 bool WebScrollbarImpl::isScrollableAreaActive() const
 {
     return m_scrollbar->isScrollableAreaActive();
@@ -118,19 +113,4 @@ bool WebScrollbarImpl::isLeftSideVerticalScrollbar() const
     return m_scrollbar->isLeftSideVerticalScrollbar();
 }
 
-bool WebScrollbarImpl::isCustomScrollbar() const
-{
-    return m_scrollbar->isCustomScrollbar();
-}
-
-bool WebScrollbarImpl::isAlphaLocked() const
-{
-    return m_scrollbar->isAlphaLocked();
-}
-
-void WebScrollbarImpl::setIsAlphaLocked(bool flag)
-{
-    m_scrollbar->setIsAlphaLocked(flag);
-}
-
 } // namespace blink