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

third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PropertyTreeState_h
 #define PropertyTreeState_h
 
 #include "platform/graphics/paint/ClipPaintPropertyNode.h"
 #include "platform/graphics/paint/EffectPaintPropertyNode.h"
 #include "platform/graphics/paint/TransformPaintPropertyNode.h"
@@ skipping 146 matching lines @@
     m_nodeToDebugString.set(node, debugInfo);
   }
 
   void addAllPropertyNodes(StringBuilder& stringBuilder,
                            const PropertyTreeNode* node,
                            unsigned indent = 0) {
     DCHECK(node);
     for (unsigned i = 0; i < indent; i++)
       stringBuilder.append(' ');
     if (m_nodeToDebugString.contains(node))
-      stringBuilder.append(m_nodeToDebugString.get(node));
+      stringBuilder.append(m_nodeToDebugString.at(node));
     stringBuilder.append(String::format(" %p ", node));
     stringBuilder.append(node->toString());
     stringBuilder.append("\n");
 
     for (const auto* childNode : m_nodeToDebugString.keys()) {
       if (childNode->parent() == node)
         addAllPropertyNodes(stringBuilder, childNode, indent + 2);
     }
   }
 
   HashMap<const PropertyTreeNode*, String> m_nodeToDebugString;
 };
 
 #endif
 
 }  // namespace blink
 
 #endif  // PropertyTreeState_h