Modified the pepper file chooser API to support filtering files by extensions.

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 28 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");
+    std::string accept_types = (multi_select ? "" : "plain/text");
 
-    chooser_ = pp::FileChooser_Dev(this, mode, accept_mime_types);
+    chooser_ = pp::FileChooser_Dev(this, mode, accept_types);
     chooser_.Show(callback_factory_.NewCallbackWithOutput(
         &MyInstance::ShowSelectedFileNames));
   }
 
   void ShowSelectedFileNames(int32_t result,
                              const std::vector<pp::FileRef>& files) {
     if (result != PP_OK)
       return;
     for (size_t i = 0; i < files.size(); i++)
       Log(files[i].GetName());
@@ skipping 34 matching lines @@
 };
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp