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

third_party/WebKit/Source/core/dom/WeakIdentifierMap.h

 // Copyright 2015 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 WeakIdentifierMap_h
 #define WeakIdentifierMap_h
 
 #include "platform/heap/Handle.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashMap.h"
@@ skipping 32 matching lines @@
   IdentifierToObject m_identifierToObject;
 };
 
 template <typename T, typename IdentifierType = int>
 class WeakIdentifierMap final
     : public WeakIdentifierMapBase<T,
                                    IdentifierType,
                                    IsGarbageCollectedType<T>::value> {
  public:
   static IdentifierType identifier(T* object) {
-    IdentifierType result = instance().m_objectToIdentifier.get(object);
+    IdentifierType result = instance().m_objectToIdentifier.at(object);
 
     if (WTF::isHashTraitsEmptyValue<HashTraits<IdentifierType>>(result)) {
       result = next();
       instance().put(object, result);
     }
     return result;
   }
 
   static T* lookup(IdentifierType identifier) {
-    return instance().m_identifierToObject.get(identifier);
+    return instance().m_identifierToObject.at(identifier);
   }
 
   static void notifyObjectDestroyed(T* object) {
     instance().objectDestroyed(object);
   }
 
  private:
   static WeakIdentifierMap<T, IdentifierType>& instance();
 
   WeakIdentifierMap() {}
@@ skipping 29 matching lines @@
   WeakIdentifierMap<T, ##__VA_ARGS__>::instance() {                   \
     using RefType = WeakIdentifierMap<T, ##__VA_ARGS__>;              \
     DEFINE_STATIC_LOCAL(RefType, mapInstance,                         \
                         (new WeakIdentifierMap<T, ##__VA_ARGS__>())); \
     return mapInstance;                                               \
   }
 
 }  // namespace blink
 
 #endif  // WeakIdentifierMap_h