Use std::unique_ptr<base::Value> in V8ValueConverter.

content/renderer/gpu/gpu_benchmarking_extension.cc

Index: content/renderer/gpu/gpu_benchmarking_extension.cc
diff --git a/content/renderer/gpu/gpu_benchmarking_extension.cc b/content/renderer/gpu/gpu_benchmarking_extension.cc
index 8fe5bae7d4889f1e6ea25c7f664b61aeae027afc..42f6995ff233dda56270b1647573847c6c171578 100644
--- a/content/renderer/gpu/gpu_benchmarking_extension.cc
+++ b/content/renderer/gpu/gpu_benchmarking_extension.cc
@@ -910,7 +910,7 @@ int GpuBenchmarking::RunMicroBenchmark(gin::Arguments* args) {
       base::WrapUnique(V8ValueConverter::create());
   v8::Local<v8::Context> v8_context = callback_and_context->GetContext();
   std::unique_ptr<base::Value> value =
-      base::WrapUnique(converter->FromV8Value(arguments, v8_context));
+      converter->FromV8Value(arguments, v8_context);
 
   return context.compositor()->ScheduleMicroBenchmark(
       name, std::move(value),
@@ -930,7 +930,7 @@ bool GpuBenchmarking::SendMessageToMicroBenchmark(
   v8::Local<v8::Context> v8_context =
       context.web_frame()->mainWorldScriptContext();
   std::unique_ptr<base::Value> value =
-      base::WrapUnique(converter->FromV8Value(message, v8_context));
+      converter->FromV8Value(message, v8_context);
 
   return context.compositor()->SendMessageToMicroBenchmark(id,
                                                            std::move(value));