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

ppapi/cpp/dev/text_input_dev.h

 // 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.
 
 #ifndef PPAPI_CPP_DEV_TEXT_INPUT_DEV_H_
 #define PPAPI_CPP_DEV_TEXT_INPUT_DEV_H_
 
 #include "ppapi/c/dev/ppb_text_input_dev.h"
+#include "ppapi/cpp/instance_handle.h"
 
 /// @file
 /// This file defines the API for controlling text input methods.
 namespace pp {
 
-class Instance;
 class Rect;
 
 class TextInput_Dev {
  public:
-  explicit TextInput_Dev(Instance* instance);
+  explicit TextInput_Dev(const InstanceHandle& instance);
   virtual ~TextInput_Dev();
 
   void SetTextInputType(PP_TextInput_Type type);
   void UpdateCaretPosition(const Rect& caret, const Rect& bounding_box);
   void CancelCompositionText();
 
  private:
-  Instance* instance_;
+  InstanceHandle instance_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_TEXT_INPUT_DEV_H_