Make the file chooser use PP_ArrayOutput

ppapi/examples/file_chooser/file_chooser.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/c/dev/ppb_file_chooser_dev.h"
 #include "ppapi/c/pp_input_event.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/dev/file_chooser_dev.h"
 #include "ppapi/cpp/file_ref.h"
 #include "ppapi/cpp/input_event.h"
@@ skipping 31 matching lines @@
  private:
   void ShowFileChooser(bool multi_select) {
     RecreateConsole();
 
     PP_FileChooserMode_Dev mode =
         (multi_select ? PP_FILECHOOSERMODE_OPENMULTIPLE
                       : PP_FILECHOOSERMODE_OPEN);
     std::string accept_mime_types = (multi_select ? "" : "plain/text");
 
     chooser_ = pp::FileChooser_Dev(this, mode, accept_mime_types);
-    chooser_.Show(callback_factory_.NewCallback(
+    chooser_.Show(callback_factory_.NewCallbackWithOutput(
         &MyInstance::ShowSelectedFileNames));
   }
 
-  void ShowSelectedFileNames(int32_t result) {
-    if (!result != PP_OK)
+  void ShowSelectedFileNames(int32_t result,
+                             const std::vector<pp::FileRef>& files) {
+    if (result != PP_OK)
       return;
-
-    pp::FileRef file_ref = chooser_.GetNextChosenFile();
-    while (!file_ref.is_null()) {
-      Log(file_ref.GetName());
-      file_ref = chooser_.GetNextChosenFile();
-    }
+    for (size_t i = 0; i < files.size(); i++)
+      Log(files[i].GetName());
   }
 
   void RecreateConsole() {
     pp::VarPrivate doc = GetWindowObject().GetProperty("document");
     pp::VarPrivate body = doc.GetProperty("body");
     if (!console_.is_undefined())
       body.Call("removeChild", console_);
 
     console_ = doc.Call("createElement", "pre");
     console_.SetProperty("id", "console");
@@ skipping 24 matching lines @@
 };
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp