PPAPI: Move PPB_DirectoryReader_Dev to stable (won't commit)

ppapi/cpp/dev/file_chooser_dev.h

Index: ppapi/cpp/dev/file_chooser_dev.h
diff --git a/ppapi/cpp/dev/file_chooser_dev.h b/ppapi/cpp/dev/file_chooser_dev.h
index 10b0ba0122c7fc2f71d4ca57fe6df537beba3b16..82b716bb48d3827d146e4f4aad6e58da849140ce 100644
--- a/ppapi/cpp/dev/file_chooser_dev.h
+++ b/ppapi/cpp/dev/file_chooser_dev.h
@@ -33,8 +33,8 @@ class FileChooser_Dev : public Resource {
   /// file (PP_FILECHOOSERMODE_OPEN) or multiple files
   /// (PP_FILECHOOSERMODE_OPENMULTIPLE). Unlike the HTML5 <input type="file">
   /// tag, a PPB_FileChooser_Dev instance cannot be used to select a directory.
-  /// In order to get the list of files in a directory, the
-  /// PPB_DirectoryReader_Dev interface must be used.
+  /// In order to get the list of files in a directory, the PPB_DirectoryReader
+  /// interface must be used.
   ///
   /// @param accept_types A comma-separated list of MIME types and file
   /// extensions such as "audio/ *,text/plain,.html" (note there should be