Make the PPP wrappers take an Instance*.

ppapi/cpp/dev/zoom_dev.h

Index: ppapi/cpp/dev/zoom_dev.h
diff --git a/ppapi/cpp/dev/zoom_dev.h b/ppapi/cpp/dev/zoom_dev.h
index 9e17ff5db9d3bba9686f0093c07fc79bb5749949..b63c0195da7717e5a1d861519b620f31b5643a6a 100644
--- a/ppapi/cpp/dev/zoom_dev.h
+++ b/ppapi/cpp/dev/zoom_dev.h
@@ -12,6 +12,8 @@
 
 namespace pp {
 
+class Instance;
+
 // This class allows you to associate the PPP_Zoom_Dev and PPB_Zoom_Dev C-based
 // interfaces with an object. It associates itself with the given instance, and
 // registers as the global handler for handling the PPP_Zoom_Dev interface that
@@ -37,7 +39,7 @@ namespace pp {
 //   };
 class Zoom_Dev {
  public:
-  explicit Zoom_Dev(const InstanceHandle& instance);
+  explicit Zoom_Dev(Instance* instance);
   virtual ~Zoom_Dev();
 
   // PPP_Zoom_Dev functions exposed as virtual functions for you to