Make the PPP wrappers take an Instance*.

ppapi/cpp/graphics_3d_client.cc

Index: ppapi/cpp/graphics_3d_client.cc
diff --git a/ppapi/cpp/graphics_3d_client.cc b/ppapi/cpp/graphics_3d_client.cc
index 6702c057e0836a4e1dab34cd747d0df478e00fd7..a00d2f3db99185451a5aeda0d794c1aefe193573 100644
--- a/ppapi/cpp/graphics_3d_client.cc
+++ b/ppapi/cpp/graphics_3d_client.cc
@@ -30,11 +30,11 @@ static PPP_Graphics3D graphics3d_interface = {
 
 }  // namespace
 
-Graphics3DClient::Graphics3DClient(const InstanceHandle& instance)
+Graphics3DClient::Graphics3DClient(Instance* instance)
     : associated_instance_(instance) {
   Module::Get()->AddPluginInterface(kPPPGraphics3DInterface,
                                     &graphics3d_interface);
-  Instance::AddPerInstanceObject(instance, kPPPGraphics3DInterface, this);
+  instance->AddPerInstanceObject(kPPPGraphics3DInterface, this);
 }
 
 Graphics3DClient::~Graphics3DClient() {