Make the PPP wrappers take an Instance*.

ppapi/cpp/graphics_3d_client.h

Index: ppapi/cpp/graphics_3d_client.h
diff --git a/ppapi/cpp/graphics_3d_client.h b/ppapi/cpp/graphics_3d_client.h
index 5886b8466ba62fee816d21cd53fc759258dab77c..186acd4bfd3bbd5c912d76f7838a3a1e5624d1af 100644
--- a/ppapi/cpp/graphics_3d_client.h
+++ b/ppapi/cpp/graphics_3d_client.h
@@ -13,6 +13,8 @@
 
 namespace pp {
 
+class Instance;
+
 // This class provides a C++ interface for callbacks related to 3D. You
 // would normally use multiple inheritance to derive from this class in your
 // instance.
@@ -23,7 +25,7 @@ class Graphics3DClient {
   ///
   /// @param[in] instance The instance that will own the new
   /// <code>Graphics3DClient</code>.
-  explicit Graphics3DClient(const InstanceHandle& instance);
+  explicit Graphics3DClient(Instance* instance);
 
   /// Destructor.
   virtual ~Graphics3DClient();