Avoid WTF::Vector::at() and operator[] in core/html.

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

Index: third_party/WebKit/Source/core/html/HTMLElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLElement.cpp b/third_party/WebKit/Source/core/html/HTMLElement.cpp
index 0bf6ef826db5e5c44e923ec5000290a82c0bb844..f09922197c3f80765ef167fa650db48f8669f711 100644
--- a/third_party/WebKit/Source/core/html/HTMLElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLElement.cpp
@@ -419,9 +419,8 @@ const AtomicString& HTMLElement::eventNameForAttributeName(
         {onwheelAttr, EventTypeNames::wheel},
     };
 
-    for (size_t i = 0; i < WTF_ARRAY_LENGTH(attrToEventNames); i++)
-      attributeNameToEventNameMap.set(attrToEventNames[i].attr.localName(),
-                                      attrToEventNames[i].event);
+    for (const auto& name : attrToEventNames)
+      attributeNameToEventNameMap.set(name.attr.localName(), name.event);
   }
 
   return attributeNameToEventNameMap.get(attrName.localName());