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

ppapi/cpp/file_io.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/cpp/file_io.h"
 
 #include "ppapi/c/ppb_file_io.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/file_ref.h"
-#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/module_impl.h"
 
 namespace pp {
 
 namespace {
 
 template <> const char* interface_name<PPB_FileIO>() {
   return PPB_FILEIO_INTERFACE;
 }
 
 }  // namespace
 
 FileIO::FileIO() {
 }
 
-FileIO::FileIO(Instance* instance) {
+FileIO::FileIO(const InstanceHandle& instance) {
   if (!has_interface<PPB_FileIO>())
     return;
   PassRefFromConstructor(get_interface<PPB_FileIO>()->Create(
-      instance->pp_instance()));
+      instance.pp_instance()));
 }
 
 FileIO::FileIO(const FileIO& other)
     : Resource(other) {
 }
 
 int32_t FileIO::Open(const FileRef& file_ref,
                      int32_t open_flags,
                      const CompletionCallback& cc) {
   if (!has_interface<PPB_FileIO>())
@@ skipping 57 matching lines @@
       pp_resource(), cc.pp_completion_callback());
 }
 
 void FileIO::Close() {
   if (!has_interface<PPB_FileIO>())
     return;
   get_interface<PPB_FileIO>()->Close(pp_resource());
 }
 
 }  // namespace pp