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

third_party/WebKit/Source/core/svg/SVGElementProxy.cpp

 // 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.
 
 #include "core/svg/SVGElementProxy.h"
 
 #include "core/dom/IdTargetObserver.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/SVGResourceClient.h"
 #include "platform/loader/fetch/FetchInitiatorTypeNames.h"
@@ skipping 151 matching lines @@
             : nullptr;
     if (proxySet) {
       proxySet->add(*this);
       return toSVGElement(targetElement);
     }
   }
   return nullptr;
 }
 
 void SVGElementProxy::contentChanged(TreeScope& treeScope) {
-  if (auto* observer = m_observers.get(&treeScope))
+  if (auto* observer = m_observers.at(&treeScope))
     observer->contentChanged();
 }
 
 DEFINE_TRACE(SVGElementProxy) {
   visitor->trace(m_clients);
   visitor->trace(m_observers);
   visitor->trace(m_document);
 }
 
 void SVGElementProxySet::add(SVGElementProxy& elementProxy) {
   m_elementProxies.insert(&elementProxy);
 }
 
 bool SVGElementProxySet::isEmpty() const {
   return m_elementProxies.isEmpty();
 }
 
 void SVGElementProxySet::notifyContentChanged(TreeScope& treeScope) {
   for (SVGElementProxy* proxy : m_elementProxies)
     proxy->contentChanged(treeScope);
 }
 
 DEFINE_TRACE(SVGElementProxySet) {
   visitor->trace(m_elementProxies);
 }
 
 }  // namespace blink