Convert //gin to use std::unique_ptr

gin/isolate_holder.cc

Index: gin/isolate_holder.cc
diff --git a/gin/isolate_holder.cc b/gin/isolate_holder.cc
index c05cd1e42db03c95849df9c022a0315a65b2f39f..5252400c13c5572251f72dcfb5b5e86c95ec3685 100644
--- a/gin/isolate_holder.cc
+++ b/gin/isolate_holder.cc
@@ -7,6 +7,8 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
+
+#include <memory>
 #include <utility>
 
 #include "base/logging.h"
@@ -96,7 +98,7 @@ void IsolateHolder::RemoveRunMicrotasksObserver() {
 }
 
 void IsolateHolder::EnableIdleTasks(
-    scoped_ptr<V8IdleTaskRunner> idle_task_runner) {
+    std::unique_ptr<V8IdleTaskRunner> idle_task_runner) {
   DCHECK(isolate_data_.get());
   isolate_data_->EnableIdleTasks(std::move(idle_task_runner));
 }