Convert //extensions/renderer from scoped_ptr to std::unique_ptr

extensions/renderer/json_schema_unittest.cc

Index: extensions/renderer/json_schema_unittest.cc
diff --git a/extensions/renderer/json_schema_unittest.cc b/extensions/renderer/json_schema_unittest.cc
index 3a2191cad0fa7a6b5b757b299a353d4360bb7b9c..b5e878fb3503015a838a5fe8a3a4bffae833bccb 100644
--- a/extensions/renderer/json_schema_unittest.cc
+++ b/extensions/renderer/json_schema_unittest.cc
@@ -79,7 +79,7 @@ TEST_F(JsonSchemaTest, TestType) {
   {
     // Create an ArrayBuffer in another v8 context and pass it to the test
     // through a global.
-    scoped_ptr<ModuleSystemTestEnvironment> other_env(CreateEnvironment());
+    std::unique_ptr<ModuleSystemTestEnvironment> other_env(CreateEnvironment());
     v8::Context::Scope scope(other_env->context()->v8_context());
     v8::Local<v8::ArrayBuffer> array_buffer(
         v8::ArrayBuffer::New(env()->isolate(), 1));