Replace ASSERT with DCHECK in platform/

third_party/WebKit/Source/platform/scroll/Scrollbar.cpp

 /*
  * Copyright (C) 2004, 2006, 2008 Apple 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 103 matching lines @@
   return scrollable_area_ && scrollable_area_->IsActive();
 }
 
 bool Scrollbar::IsLeftSideVerticalScrollbar() const {
   if (orientation_ == kVerticalScrollbar && scrollable_area_)
     return scrollable_area_->ShouldPlaceVerticalScrollbarOnLeft();
   return false;
 }
 
 void Scrollbar::OffsetDidChange() {
-  ASSERT(scrollable_area_);
+  DCHECK(scrollable_area_);
 
   float position = ScrollableAreaCurrentPos();
   if (position == current_pos_)
     return;
 
   float old_position = current_pos_;
   int old_thumb_position = GetTheme().ThumbPosition(*this);
   current_pos_ = position;
 
   ScrollbarPart invalid_parts =
@@ skipping 502 matching lines @@
     invalid_parts = kAllParts;
   if (invalid_parts & ~kThumbPart)
     track_needs_repaint_ = true;
   if (invalid_parts & kThumbPart)
     thumb_needs_repaint_ = true;
   if (scrollable_area_)
     scrollable_area_->SetScrollbarNeedsPaintInvalidation(Orientation());
 }
 
 }  // namespace blink