PendingChanges = function () {
  // Format: pendingFontChanges_.Cyrl.sansserif = "My SansSerif Cyrillic Font"
  this.pendingFontChanges_ = {};

  // Format: pendingFontSizeChanges_.defaultFontSize = 12
  this.pendingFontSizeChanges_ = {};
}
Creates a PendingChanges object with no pending changes.

@constructor