convert //gpu to std::unique_ptr

content/browser/compositor/gpu_process_transport_factory.cc

Index: content/browser/compositor/gpu_process_transport_factory.cc
diff --git a/content/browser/compositor/gpu_process_transport_factory.cc b/content/browser/compositor/gpu_process_transport_factory.cc
index 14718e5bb3aa0b4d96513cb157839682ccc74be9..a69ea89bb8a390af7303e3206ac6bb8396ef41c7 100644
--- a/content/browser/compositor/gpu_process_transport_factory.cc
+++ b/content/browser/compositor/gpu_process_transport_factory.cc
@@ -440,7 +440,7 @@ void GpuProcessTransportFactory::RemoveCompositor(ui::Compositor* compositor) {
     // causing things to request a new GLHelper. Due to crbug.com/176091 the
     // GLHelper created in this case would be lost/leaked if we just reset()
     // on the |gl_helper_| variable directly. So instead we call reset() on a
-    // local scoped_ptr.
+    // local std::unique_ptr.
     std::unique_ptr<GLHelper> helper = std::move(gl_helper_);
 
     // If there are any observer left at this point, make sure they clean up