Convert //ash from scoped_ptr to std::unique_ptr

ash/display/json_converter_unittest.cc

Index: ash/display/json_converter_unittest.cc
diff --git a/ash/display/json_converter_unittest.cc b/ash/display/json_converter_unittest.cc
index 1d14ef1a0aea2f740c00e046116f1d4a4521ea49..0b56f86af9aa3c9337ab8a24a61b9211bf58da19 100644
--- a/ash/display/json_converter_unittest.cc
+++ b/ash/display/json_converter_unittest.cc
@@ -49,7 +49,7 @@ TEST(JsonConverterTest, JsonFromToDisplayLayout) {
       "}";
   int error_code = 0, error_line, error_column;
   std::string error_msg;
-  scoped_ptr<base::Value> read_value(base::JSONReader::ReadAndReturnError(
+  std::unique_ptr<base::Value> read_value(base::JSONReader::ReadAndReturnError(
       data, 0, &error_code, &error_msg, &error_line, &error_column));
   ASSERT_EQ(0, error_code) << error_msg << " at " << error_line << ":"
                            << error_column;
@@ -74,7 +74,7 @@ TEST(JsonConverterTest, OldJsonToDisplayLayout) {
       "}";
   int error_code = 0, error_line, error_column;
   std::string error_msg;
-  scoped_ptr<base::Value> read_value(base::JSONReader::ReadAndReturnError(
+  std::unique_ptr<base::Value> read_value(base::JSONReader::ReadAndReturnError(
       data, 0, &error_code, &error_msg, &error_line, &error_column));
   ASSERT_EQ(0, error_code) << error_msg << " at " << error_line << ":"
                            << error_column;