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

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

Index: third_party/WebKit/Source/core/svg/SVGTreeScopeResources.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGTreeScopeResources.cpp b/third_party/WebKit/Source/core/svg/SVGTreeScopeResources.cpp
index 9617851877e31b78a83c69b68631c2ae233c8ad2..e6b9c97957ccc00c98f18d355dc689667911860d 100644
--- a/third_party/WebKit/Source/core/svg/SVGTreeScopeResources.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGTreeScopeResources.cpp
@@ -64,7 +64,7 @@ LayoutSVGResourceContainer* SVGTreeScopeResources::resourceById(
     const AtomicString& id) const {
   if (id.isEmpty())
     return nullptr;
-  return m_resources.get(id);
+  return m_resources.at(id);
 }
 
 void SVGTreeScopeResources::addPendingResource(const AtomicString& id,
@@ -112,7 +112,7 @@ bool SVGTreeScopeResources::isElementPendingResource(
   DCHECK(element);
   if (!hasPendingResource(id))
     return false;
-  return m_pendingResources.get(id)->contains(element);
+  return m_pendingResources.at(id)->contains(element);
 }
 
 void SVGTreeScopeResources::clearHasPendingResourcesIfPossible(