WTF/std normalization: replace WTF::Vector::last with ::back

third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
index 20435e48b15ab59d3df948a0b66c59e53a239430..ce8c01c0b09f55b241e3c7c67d3c3a8126570dfe 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
@@ -1135,8 +1135,8 @@ String AXLayoutObject::textAlternative(bool recursive,
       nameFrom = AXNameFromContents;
       if (nameSources) {
         nameSources->append(NameSource(false));
-        nameSources->last().type = nameFrom;
-        nameSources->last().text = textAlternative;
+        nameSources->back().type = nameFrom;
+        nameSources->back().text = textAlternative;
       }
       return textAlternative;
     }
@@ -2303,7 +2303,7 @@ void AXLayoutObject::addHiddenChildren() {
       if (AXObject* childObject = axObjectCache().get(child.layoutObject())) {
         if (childObject->accessibilityIsIgnored()) {
           const auto& children = childObject->children();
-          childObject = children.size() ? children.last().get() : 0;
+          childObject = children.size() ? children.back().get() : 0;
         }
         if (childObject)
           insertionIndex = m_children.find(childObject) + 1;