Convert //chrome/browser/ui from scoped_ptr to std::unique_ptr

chrome/browser/ui/webui/policy_material_design_ui.cc

Index: chrome/browser/ui/webui/policy_material_design_ui.cc
diff --git a/chrome/browser/ui/webui/policy_material_design_ui.cc b/chrome/browser/ui/webui/policy_material_design_ui.cc
index 081b0a28cc53288af7b77c3a6423b9e7261daac4..1703d50fa9fd239eade500158e1b83ec9c30f29b 100644
--- a/chrome/browser/ui/webui/policy_material_design_ui.cc
+++ b/chrome/browser/ui/webui/policy_material_design_ui.cc
@@ -72,7 +72,7 @@ PolicyMaterialDesignUIHandler::~PolicyMaterialDesignUIHandler() {
 
 void PolicyMaterialDesignUIHandler::AddPolicyName(
     const std::string& name, base::DictionaryValue* names) const {
-  scoped_ptr<base::ListValue> list(new base::ListValue());
+  std::unique_ptr<base::ListValue> list(new base::ListValue());
   const policy::RiskTag* tags = policy::GetChromePolicyDetails(name)->risk_tags;
   for (size_t i = 0; i < policy::kMaxRiskTagCount; ++i) {
     if (tags[i] != policy::RISK_TAG_NONE)