gpu: Fix Mac fullscreen video

gpu/ipc/service/pass_through_image_transport_surface.cc

Index: gpu/ipc/service/pass_through_image_transport_surface.cc
diff --git a/gpu/ipc/service/pass_through_image_transport_surface.cc b/gpu/ipc/service/pass_through_image_transport_surface.cc
index 1e3f153b5377c969bb6e1acb68503e7bc583cb28..e269cd2c935bdbad34961a02ccc6e3340fcfaa01 100644
--- a/gpu/ipc/service/pass_through_image_transport_surface.cc
+++ b/gpu/ipc/service/pass_through_image_transport_surface.cc
@@ -142,8 +142,6 @@ void PassThroughImageTransportSurface::SetLatencyInfo(
 void PassThroughImageTransportSurface::SendVSyncUpdateIfAvailable() {
   gfx::VSyncProvider* vsync_provider = GetVSyncProvider();
   if (vsync_provider) {
-    // PassThroughImageTransportSurface owns the VSyncProvider and will
-    // outlive it. Thus, base::Unretained is safe here.
     vsync_provider->GetVSyncParameters(base::Bind(
         &ImageTransportSurfaceDelegate::UpdateVSyncParameters, delegate_));
   }