Convert //tools to use std::unique_ptr

tools/json_schema_compiler/test/callbacks_unittest.cc

Index: tools/json_schema_compiler/test/callbacks_unittest.cc
diff --git a/tools/json_schema_compiler/test/callbacks_unittest.cc b/tools/json_schema_compiler/test/callbacks_unittest.cc
index a12584da2cf4cadfbd998fa16645788957d978b5..f213bb84b5b3845b4db26183b3bb5ad18b12aaab 100644
--- a/tools/json_schema_compiler/test/callbacks_unittest.cc
+++ b/tools/json_schema_compiler/test/callbacks_unittest.cc
@@ -11,7 +11,7 @@ using namespace test::api::callbacks;
 TEST(JsonSchemaCompilerCallbacksTest, ReturnsObjectResultCreate) {
   ReturnsObject::Results::SomeObject some_object;
   some_object.state = ENUMERATION_FOO;
-  scoped_ptr<base::ListValue> results =
+  std::unique_ptr<base::ListValue> results =
       ReturnsObject::Results::Create(some_object);
 
   base::DictionaryValue* expected_dict = new base::DictionaryValue();
@@ -24,7 +24,7 @@ TEST(JsonSchemaCompilerCallbacksTest, ReturnsObjectResultCreate) {
 TEST(JsonSchemaCompilerCallbacksTest, ReturnsMultipleResultCreate) {
   ReturnsMultiple::Results::SomeObject some_object;
   some_object.state = ENUMERATION_FOO;
-  scoped_ptr<base::ListValue> results =
+  std::unique_ptr<base::ListValue> results =
       ReturnsMultiple::Results::Create(5, some_object);
 
   base::DictionaryValue* expected_dict = new base::DictionaryValue();