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

third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp

Index: third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp b/third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp
index c14205ed362668a2ff0c5168a02f709639dc24a4..f91c2ce2fa13e74f720308e8488a4ed36652142a 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLConstructionSite.cpp
@@ -321,8 +321,8 @@ void HTMLConstructionSite::executeQueuedTasks() {
   TaskQueue queue;
   queue.swap(m_taskQueue);
 
-  for (size_t i = 0; i < size; ++i)
-    executeTask(queue[i]);
+  for (auto& task : queue)
+    executeTask(task);
 
   // We might be detached now.
 }
@@ -407,8 +407,7 @@ void HTMLConstructionSite::mergeAttributesFromTokenIntoElement(
   if (token->attributes().isEmpty())
     return;
 
-  for (unsigned i = 0; i < token->attributes().size(); ++i) {
-    const Attribute& tokenAttribute = token->attributes().at(i);
+  for (const auto& tokenAttribute : token->attributes()) {
     if (element->attributesWithoutUpdate().findIndex(tokenAttribute.name()) ==
         kNotFound)
       element->setAttribute(tokenAttribute.name(), tokenAttribute.value());