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

ppapi/example/example.cc

Index: ppapi/example/example.cc
diff --git a/ppapi/example/example.cc b/ppapi/example/example.cc
index 8319d4981da6c57e85d9a00378e34c89d9bc036e..17ac0370886d7963d4eedbd0f0d84acdcb6a3610 100644
--- a/ppapi/example/example.cc
+++ b/ppapi/example/example.cc
@@ -98,14 +98,14 @@ class MyFetcher {
     callback_factory_.Initialize(this);
   }
 
-  void Start(const pp::InstancePrivate& instance,
+  void Start(pp::Instance* instance,
              const pp::Var& url,
              MyFetcherClient* client) {
     pp::URLRequestInfo request;
     request.SetURL(url);
     request.SetMethod("GET");
 
-    loader_ = pp::URLLoader(instance);
+    loader_ = pp::URLLoader(pp::InstanceHandle(instance));
     client_ = client;
 
     pp::CompletionCallback callback =
@@ -415,7 +415,7 @@ int gettimeofday(struct timeval *tv, struct timezone*) {
 
     if (!fetcher_) {
       fetcher_ = new MyFetcher();
-      fetcher_->Start(*this, href, this);
+      fetcher_->Start(this, href, this);
     }
   }