Convert resources to take an instance key instead of an Instance*.

ppapi/cpp/dev/selection_dev.cc

Index: ppapi/cpp/dev/selection_dev.cc
diff --git a/ppapi/cpp/dev/selection_dev.cc b/ppapi/cpp/dev/selection_dev.cc
index b086ac152157b980223397c088f878e522442032..37bbbeb1dfe483308de4669bc3b2fdd62153b0c1 100644
--- a/ppapi/cpp/dev/selection_dev.cc
+++ b/ppapi/cpp/dev/selection_dev.cc
@@ -5,6 +5,7 @@
 #include "ppapi/cpp/dev/selection_dev.h"
 
 #include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/var.h"
 
@@ -29,14 +30,15 @@ const PPP_Selection_Dev ppp_selection = {
 
 }  // namespace
 
-Selection_Dev::Selection_Dev(Instance* instance)
+Selection_Dev::Selection_Dev(const InstanceHandle& instance)
     : associated_instance_(instance) {
-  pp::Module::Get()->AddPluginInterface(kPPPSelectionInterface, &ppp_selection);
-  associated_instance_->AddPerInstanceObject(kPPPSelectionInterface, this);
+  Module::Get()->AddPluginInterface(kPPPSelectionInterface, &ppp_selection);
+  Instance::AddPerInstanceObject(instance, kPPPSelectionInterface, this);
 }
 
 Selection_Dev::~Selection_Dev() {
-  associated_instance_->RemovePerInstanceObject(kPPPSelectionInterface, this);
+  Instance::RemovePerInstanceObject(associated_instance_,
+                                    kPPPSelectionInterface, this);
 }
 
 }  // namespace pp