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

ppapi/cpp/mouse_lock.cc

Index: ppapi/cpp/mouse_lock.cc
diff --git a/ppapi/cpp/mouse_lock.cc b/ppapi/cpp/mouse_lock.cc
index 4d3b9bf70ee26d15d41a018050e80d6c3faf6f2d..828ee89436b5d49142453889e0fac109479c58a4 100644
--- a/ppapi/cpp/mouse_lock.cc
+++ b/ppapi/cpp/mouse_lock.cc
@@ -8,6 +8,7 @@
 #include "ppapi/c/ppp_mouse_lock.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/module_impl.h"
 
@@ -19,7 +20,7 @@ static const char kPPPMouseLockInterface[] = PPP_MOUSELOCK_INTERFACE;
 
 void MouseLockLost(PP_Instance instance) {
   void* object =
-      pp::Instance::GetPerInstanceObject(instance, kPPPMouseLockInterface);
+      Instance::GetPerInstanceObject(instance, kPPPMouseLockInterface);
   if (!object)
     return;
   static_cast<MouseLock*>(object)->MouseLockLost();
@@ -35,28 +36,28 @@ template <> const char* interface_name<PPB_MouseLock>() {
 
 }  // namespace
 
-MouseLock::MouseLock(Instance* instance)
+MouseLock::MouseLock(const InstanceHandle& instance)
     : associated_instance_(instance) {
-  pp::Module::Get()->AddPluginInterface(kPPPMouseLockInterface,
-                                        &ppp_mouse_lock);
-  associated_instance_->AddPerInstanceObject(kPPPMouseLockInterface, this);
+  Module::Get()->AddPluginInterface(kPPPMouseLockInterface, &ppp_mouse_lock);
+  Instance::AddPerInstanceObject(instance, kPPPMouseLockInterface, this);
 }
 
 MouseLock::~MouseLock() {
-  associated_instance_->RemovePerInstanceObject(kPPPMouseLockInterface, this);
+  Instance::RemovePerInstanceObject(associated_instance_,
+                                    kPPPMouseLockInterface, this);
 }
 
 int32_t MouseLock::LockMouse(const CompletionCallback& cc) {
   if (!has_interface<PPB_MouseLock>())
     return cc.MayForce(PP_ERROR_NOINTERFACE);
   return get_interface<PPB_MouseLock>()->LockMouse(
-      associated_instance_->pp_instance(), cc.pp_completion_callback());
+      associated_instance_.pp_instance(), cc.pp_completion_callback());
 }
 
 void MouseLock::UnlockMouse() {
   if (has_interface<PPB_MouseLock>()) {
     get_interface<PPB_MouseLock>()->UnlockMouse(
-        associated_instance_->pp_instance());
+        associated_instance_.pp_instance());
   }
 }