aura: Remove sync point methods from ImageTransportFactory api.

content/browser/aura/no_transport_image_transport_factory.cc

Index: content/browser/aura/no_transport_image_transport_factory.cc
diff --git a/content/browser/aura/no_transport_image_transport_factory.cc b/content/browser/aura/no_transport_image_transport_factory.cc
index 6db87ac494a4fc9a9994dd146be460dda2a4634d..d9cee1831c726fa190cddfb3bb63ba00e5b58ccc 100644
--- a/content/browser/aura/no_transport_image_transport_factory.cc
+++ b/content/browser/aura/no_transport_image_transport_factory.cc
@@ -83,10 +83,6 @@ GLHelper* NoTransportImageTransportFactory::GetGLHelper() {
   return gl_helper_.get();
 }
 
-uint32 NoTransportImageTransportFactory::InsertSyncPoint() { return 0; }
-
-void NoTransportImageTransportFactory::WaitSyncPoint(uint32 sync_point) {}
-
 // We don't generate lost context events, so we don't need to keep track of
 // observers
 void NoTransportImageTransportFactory::AddObserver(