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

third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2012 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 574 matching lines @@
     case UnitType::CalcPercentageWithLengthAndNumber:
       break;
   };
   ASSERT_NOT_REACHED();
   return "";
 }
 
 String CSSPrimitiveValue::customCSSText() const {
   if (m_hasCachedCSSText) {
     ASSERT(cssTextCache().contains(this));
-    return cssTextCache().get(this);
+    return cssTextCache().at(this);
   }
 
   String text;
   switch (type()) {
     case UnitType::Unknown:
       // FIXME
       break;
     case UnitType::Integer:
       text = String::format("%d", getIntValue());
       break;
@@ skipping 102 matching lines @@
     case UnitType::Calc:
       visitor->trace(m_value.calc);
       break;
     default:
       break;
   }
   CSSValue::traceAfterDispatch(visitor);
 }
 
 }  // namespace blink