Convert //gin to use std::unique_ptr

gin/public/context_holder.h

Index: gin/public/context_holder.h
diff --git a/gin/public/context_holder.h b/gin/public/context_holder.h
index 176af1754fe08c5a4cb4cfc36619f0fa8df0ae86..f0efc9b6473f89eb26694c895f4b300dc4a1f499 100644
--- a/gin/public/context_holder.h
+++ b/gin/public/context_holder.h
@@ -6,9 +6,9 @@
 #define GIN_PUBLIC_CONTEXT_HOLDER_H_
 
 #include <list>
+#include <memory>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "gin/gin_export.h"
 #include "v8/include/v8.h"
 
@@ -42,7 +42,7 @@ class GIN_EXPORT ContextHolder {
  private:
   v8::Isolate* isolate_;
   v8::UniquePersistent<v8::Context> context_;
-  scoped_ptr<PerContextData> data_;
+  std::unique_ptr<PerContextData> data_;
 
   DISALLOW_COPY_AND_ASSIGN(ContextHolder);
 };