WTF/std normalization: replace WTF::Vector::first() with ::front()

third_party/WebKit/Source/core/html/HTMLCollection.cpp

Index: third_party/WebKit/Source/core/html/HTMLCollection.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLCollection.cpp b/third_party/WebKit/Source/core/html/HTMLCollection.cpp
index 10a1735bd2b420c6fcf8aa4ce5c43a83cdbcb454..fcb65c161fdc31e2ee0b67db23f8bd2d8614ef51 100644
--- a/third_party/WebKit/Source/core/html/HTMLCollection.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLCollection.cpp
@@ -413,11 +413,11 @@ Element* HTMLCollection::namedItem(const AtomicString& name) const {
   const NamedItemCache& cache = namedItemCache();
   HeapVector<Member<Element>>* idResults = cache.getElementsById(name);
   if (idResults && !idResults->isEmpty())
-    return idResults->first();
+    return idResults->front();
 
   HeapVector<Member<Element>>* nameResults = cache.getElementsByName(name);
   if (nameResults && !nameResults->isEmpty())
-    return nameResults->first();
+    return nameResults->front();
 
   return nullptr;
 }