Convert //sandbox to use std::unique_ptr

sandbox/win/src/address_sanitizer_test.cc

Index: sandbox/win/src/address_sanitizer_test.cc
diff --git a/sandbox/win/src/address_sanitizer_test.cc b/sandbox/win/src/address_sanitizer_test.cc
index db39d6b90ab6e1e9ebaa70eae2d042e52e64cf66..d7e5e46c0afc13ce7205f9c943c6031113d2b730 100644
--- a/sandbox/win/src/address_sanitizer_test.cc
+++ b/sandbox/win/src/address_sanitizer_test.cc
@@ -4,6 +4,8 @@
 
 #include <stdio.h>
 
+#include <memory>
+
 #include "base/environment.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ -32,7 +34,7 @@ class AddressSanitizerTests : public ::testing::Test {
   }
 
  protected:
-  scoped_ptr<base::Environment> env_;
+  std::unique_ptr<base::Environment> env_;
   bool had_asan_options_;
   std::string old_asan_options_;
 };