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

ppapi/cpp/dev/url_util_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_URL_UTIL_DEV_H_
 #define PPAPI_CPP_DEV_URL_UTIL_DEV_H_
 
 #include "ppapi/c/dev/ppb_url_util_dev.h"
 #include "ppapi/cpp/var.h"
 
 namespace pp {
 
-class Instance;
+class InstanceHandle;
 
 // Simple wrapper around the PPB_URLUtil interface.
 class URLUtil_Dev {
  public:
   // This class is just a collection of random functions that aren't
   // particularly attached to anything. So this getter returns a cached
   // instance of this interface. This may return NULL if the browser doesn't
   // support the URLUtil inteface. Since this is a singleton, don't delete the
   // pointer.
   static const URLUtil_Dev* Get();
 
   Var Canonicalize(const Var& url,
                    PP_URLComponents_Dev* components = NULL) const;
 
   Var ResolveRelativeToURL(const Var& base_url,
                            const Var& relative_string,
                            PP_URLComponents_Dev* components = NULL) const;
-  Var ResolveRelativeToDocument(const Instance& instance,
+  Var ResolveRelativeToDocument(const InstanceHandle& instance,
                                 const Var& relative_string,
                                 PP_URLComponents_Dev* components = NULL) const;
 
   bool IsSameSecurityOrigin(const Var& url_a, const Var& url_b) const;
-  bool DocumentCanRequest(const Instance& instance, const Var& url) const;
-  bool DocumentCanAccessDocument(const Instance& active,
-                                 const Instance& target) const;
-  Var GetDocumentURL(const Instance& instance,
+  bool DocumentCanRequest(const InstanceHandle& instance, const Var& url) const;
+  bool DocumentCanAccessDocument(const InstanceHandle& active,
+                                 const InstanceHandle& target) const;
+  Var GetDocumentURL(const InstanceHandle& instance,
                      PP_URLComponents_Dev* components = NULL) const;
 
-  Var GetPluginInstanceURL(const Instance& instance,
+  Var GetPluginInstanceURL(const InstanceHandle& instance,
                            PP_URLComponents_Dev* components = NULL) const;
 
  private:
   URLUtil_Dev() : interface_(NULL) {}
 
   // Copy and assignment are disallowed.
   URLUtil_Dev(const URLUtil_Dev& other);
   URLUtil_Dev& operator=(const URLUtil_Dev& other);
 
   const PPB_URLUtil_Dev* interface_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_URL_UTIL_DEV_H_