Make the PPP wrappers take an Instance*.

ppapi/cpp/dev/find_dev.cc

Index: ppapi/cpp/dev/find_dev.cc
diff --git a/ppapi/cpp/dev/find_dev.cc b/ppapi/cpp/dev/find_dev.cc
index 331ee43be046f99bb8a85d60bfc4b4bd577994e9..e9640bc7e111c4751358dc3db7f0ac0db0b2158b 100644
--- a/ppapi/cpp/dev/find_dev.cc
+++ b/ppapi/cpp/dev/find_dev.cc
@@ -50,10 +50,9 @@ const PPP_Find_Dev ppp_find = {
 
 }  // namespace
 
-Find_Dev::Find_Dev(const InstanceHandle& instance)
-    : associated_instance_(instance) {
+Find_Dev::Find_Dev(Instance* instance) : associated_instance_(instance) {
   Module::Get()->AddPluginInterface(kPPPFindInterface, &ppp_find);
-  Instance::AddPerInstanceObject(instance, kPPPFindInterface, this);
+  instance->AddPerInstanceObject(kPPPFindInterface, this);
 }
 
 Find_Dev::~Find_Dev() {