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

ppapi/tests/test_flash_clipboard.cc

 // Copyright (c) 2012 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/tests/test_flash_clipboard.h"
 
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/point.h"
 #include "ppapi/tests/testing_instance.h"
@@ skipping 36 matching lines @@
 
     PlatformSleep(kIntervalMs);
   }
   return is_available;
 }
 
 std::string TestFlashClipboard::ReadStringVar(
     PP_Flash_Clipboard_Format format) {
   std::string result_str;
   pp::Var result_var(
-      pp::Var::PassRef(),
+      pp::PASS_REF,
       clipboard_interface_->ReadData(instance_->pp_instance(),
                                      PP_FLASH_CLIPBOARD_TYPE_STANDARD,
                                      format));
   if (result_var.is_string())
     result_str = result_var.AsString();
   return result_str;
 }
 
 int32_t TestFlashClipboard::WriteStringVar(PP_Flash_Clipboard_Format format,
                                            const std::string& input) {
@@ skipping 67 matching lines @@
   ASSERT_TRUE(success == PP_OK);
 
   ASSERT_TRUE(IsFormatAvailable(PP_FLASH_CLIPBOARD_FORMAT_PLAINTEXT));
   ASSERT_TRUE(IsFormatAvailable(PP_FLASH_CLIPBOARD_FORMAT_HTML));
 
   ASSERT_TRUE(ReadAndMatchPlainText(plain_text_var.AsString()));
   ASSERT_TRUE(ReadAndMatchHTML(html_var.AsString()));
 
   PASS();
 }