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

ppapi/cpp/trusted/file_chooser_trusted.cc

Index: ppapi/cpp/trusted/file_chooser_trusted.cc
diff --git a/ppapi/cpp/trusted/file_chooser_trusted.cc b/ppapi/cpp/trusted/file_chooser_trusted.cc
index 92fec74a37b8769b5a4284ada683890fc679d737..caa1b73cfaec69d1c634a0d525e73198086e1af2 100644
--- a/ppapi/cpp/trusted/file_chooser_trusted.cc
+++ b/ppapi/cpp/trusted/file_chooser_trusted.cc
@@ -30,10 +30,10 @@ FileChooser_Trusted::FileChooser_Trusted() : save_as_(false) {
 
 FileChooser_Trusted::FileChooser_Trusted(const InstanceHandle& instance,
                                          PP_FileChooserMode_Dev mode,
-                                         const Var& accept_mime_types,
+                                         const Var& accept_types,
                                          bool save_as,
                                          const std::string& suggested_file_name)
-    : FileChooser_Dev(instance, mode, accept_mime_types),
+    : FileChooser_Dev(instance, mode, accept_types),
       save_as_(save_as),
       suggested_file_name_(suggested_file_name) {
 }