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

third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp

Index: third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp
diff --git a/third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp b/third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp
index 76192bc40505fe648c8f12b47a864f279cfbd41a..b5f43eb88ddab6dff3c6db68d522ba3680d0b400 100644
--- a/third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp
+++ b/third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp
@@ -52,8 +52,8 @@ void HTMLImportsController::dispose() {
     m_root.clear();
   }
 
-  for (size_t i = 0; i < m_loaders.size(); ++i)
-    m_loaders[i]->dispose();
+  for (const auto& loader : m_loaders)
+    loader->dispose();
   m_loaders.clear();
 }
 
@@ -139,9 +139,9 @@ HTMLImportLoader* HTMLImportsController::createLoader() {
 
 HTMLImportLoader* HTMLImportsController::loaderFor(
     const Document& document) const {
-  for (size_t i = 0; i < m_loaders.size(); ++i) {
-    if (m_loaders[i]->document() == &document)
-      return m_loaders[i].get();
+  for (const auto& loader : m_loaders) {
+    if (loader->document() == &document)
+      return loader.get();
   }
 
   return nullptr;