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

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

 /*
  * Copyright (C) 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 86 matching lines @@
       removeClient(layoutObject);
       addClient(layoutObject, size);
     }
   }
 
   // Don't generate an image for empty sizes.
   if (size.isEmpty())
     return nullptr;
 
   // Look up the image in our cache.
-  return m_images.get(size);
+  return m_images.at(size);
 }
 
 void CSSImageGeneratorValue::putImage(const IntSize& size,
                                       PassRefPtr<Image> image) {
   m_images.insert(size, std::move(image));
 }
 
 PassRefPtr<Image> CSSImageGeneratorValue::image(
     const LayoutObject& layoutObject,
     const IntSize& size,
@@ skipping 93 matching lines @@
       break;
     case RadialGradientClass:
       toCSSRadialGradientValue(this)->loadSubimages(document);
       break;
     default:
       ASSERT_NOT_REACHED();
   }
 }
 
 }  // namespace blink