Migrate WTF::HashMap::get() to ::at()

third_party/WebKit/Source/core/layout/LayoutScrollbar.h

 /*
  * Copyright (C) 2008, 2009 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 41 matching lines @@
 
   IntRect buttonRect(ScrollbarPart) const;
   IntRect trackRect(int startLength, int endLength) const;
   IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&) const;
 
   int minimumThumbLength() const;
 
   bool isOverlayScrollbar() const override { return false; }
 
   LayoutScrollbarPart* getPart(ScrollbarPart partType) {
-    return m_parts.get(partType);
+    return m_parts.at(partType);
   }
   const LayoutScrollbarPart* getPart(ScrollbarPart partType) const {
-    return m_parts.get(partType);
+    return m_parts.at(partType);
   }
 
   void invalidateDisplayItemClientsOfScrollbarParts();
 
   void setVisualRect(const LayoutRect&) final;
 
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   LayoutScrollbar(ScrollableArea*, ScrollbarOrientation, Element*);
@@ skipping 24 matching lines @@
 
 DEFINE_TYPE_CASTS(LayoutScrollbar,
                   ScrollbarThemeClient,
                   scrollbar,
                   scrollbar->isCustomScrollbar(),
                   scrollbar.isCustomScrollbar());
 
 }  // namespace blink
 
 #endif  // LayoutScrollbar_h