Revert of Change base::Value::ListStorage to std::vector<base::Value>

extensions/common/manifest_handlers/action_handlers_handler.cc

Index: extensions/common/manifest_handlers/action_handlers_handler.cc
diff --git a/extensions/common/manifest_handlers/action_handlers_handler.cc b/extensions/common/manifest_handlers/action_handlers_handler.cc
index c5ac38d6f72d36ca34f943c014610ffe88a8ef88..2d303181183a8c98030968bd029d323f6d178bcd 100644
--- a/extensions/common/manifest_handlers/action_handlers_handler.cc
+++ b/extensions/common/manifest_handlers/action_handlers_handler.cc
@@ -42,9 +42,9 @@
   }
 
   auto info = base::MakeUnique<ActionHandlersInfo>();
-  for (const base::Value& wrapped_value : *entries) {
+  for (const std::unique_ptr<base::Value>& wrapped_value : *entries) {
     std::string value;
-    if (!wrapped_value.GetAsString(&value)) {
+    if (!wrapped_value->GetAsString(&value)) {
       *error = base::ASCIIToUTF16(errors::kInvalidActionHandlersType);
       return false;
     }