Cleanup: Pass std::string as const reference if possible

ui/accessibility/ax_node_data.cc

Index: ui/accessibility/ax_node_data.cc
diff --git a/ui/accessibility/ax_node_data.cc b/ui/accessibility/ax_node_data.cc
index 262e19253f376cc30f2350e1e0d727974901c69a..7f0829824b16d4656b87344e01e282c7f004aba2 100644
--- a/ui/accessibility/ax_node_data.cc
+++ b/ui/accessibility/ax_node_data.cc
@@ -244,11 +244,11 @@ void AXNodeData::AddIntListAttribute(
   intlist_attributes.push_back(std::make_pair(attribute, value));
 }
 
-void AXNodeData::SetName(std::string name) {
+void AXNodeData::SetName(const std::string& name) {
   string_attributes.push_back(std::make_pair(AX_ATTR_NAME, name));
 }
 
-void AXNodeData::SetValue(std::string value) {
+void AXNodeData::SetValue(const std::string& value) {
   string_attributes.push_back(std::make_pair(AX_ATTR_VALUE, value));
 }