Change more base::ListValue methods to use std::unique_ptr.

extensions/browser/script_executor.cc

Index: extensions/browser/script_executor.cc
diff --git a/extensions/browser/script_executor.cc b/extensions/browser/script_executor.cc
index 230bca3b3f885b2dae5fcfd6731d4402141536af..84fc2c394694cc45b5abf06bd09b6a9a9569102c 100644
--- a/extensions/browser/script_executor.cc
+++ b/extensions/browser/script_executor.cc
@@ -141,9 +141,9 @@ class Handler : public content::WebContentsObserver {
       // If this is the main result, we put it at index 0. Otherwise, we just
       // append it at the end.
       if (is_root_frame && !results_.empty())
-        CHECK(results_.Insert(0u, script_value->DeepCopy()));
+        CHECK(results_.Insert(0u, script_value->CreateDeepCopy()));
       else
-        results_.Append(script_value->DeepCopy());
+        results_.Append(script_value->CreateDeepCopy());
     }
 
     if (is_root_frame) {  // Only use the root frame's error and url.