Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

content/public/child/v8_value_converter.h

Index: content/public/child/v8_value_converter.h
diff --git a/content/public/child/v8_value_converter.h b/content/public/child/v8_value_converter.h
index a7a0e8946f0806772687d78bfe0d1b03cf58ae33..67e3025ff1a6beb68f0d32d4a193584deb007cb2 100644
--- a/content/public/child/v8_value_converter.h
+++ b/content/public/child/v8_value_converter.h
@@ -105,6 +105,7 @@ class CONTENT_EXPORT V8ValueConverter {
   // Unsupported types are replaced with null.  If an array or object throws
   // while setting a value, that property or item is skipped, leaving a hole in
   // the case of arrays.
+  // TODO(dcheng): This should just take a const reference.
   virtual v8::Local<v8::Value> ToV8Value(
       const base::Value* value,
       v8::Local<v8::Context> context) const = 0;
@@ -118,6 +119,7 @@ class CONTENT_EXPORT V8ValueConverter {
   // Likewise, if an object throws while converting a property it will not be
   // converted, whereas if an array throws while converting an item it will be
   // converted to Value(TYPE_NULL).
+  // TODO(dcheng): This should return a unique_ptr.
   virtual base::Value* FromV8Value(v8::Local<v8::Value> value,
                                    v8::Local<v8::Context> context) const = 0;
 };