Start consolidating cross-port file selection code into ui/base/dialogs.

chrome/browser/ui/gtk/select_file_dialog_impl_gtk.cc

Index: chrome/browser/ui/gtk/select_file_dialog_impl_gtk.cc
diff --git a/chrome/browser/ui/gtk/select_file_dialog_impl_gtk.cc b/chrome/browser/ui/gtk/select_file_dialog_impl_gtk.cc
index f2f5833f18835c1de4838461ebae9d28bdfd4d88..a848e607aa17d2b4ad74758ea4cf330fd0d170f7 100644
--- a/chrome/browser/ui/gtk/select_file_dialog_impl_gtk.cc
+++ b/chrome/browser/ui/gtk/select_file_dialog_impl_gtk.cc
@@ -25,7 +25,8 @@
 // choosing a file or folder. This acts as a modal dialog.
 class SelectFileDialogImplGTK : public SelectFileDialogImpl {
  public:
-  explicit SelectFileDialogImplGTK(Listener* listener);
+  explicit SelectFileDialogImplGTK(Listener* listener,
+                                   ui::SelectFilePolicy* policy);
 
  protected:
   virtual ~SelectFileDialogImplGTK();
@@ -132,12 +133,13 @@ static const int kPreviewWidth = 256;
 static const int kPreviewHeight = 512;
 
 SelectFileDialogImpl* SelectFileDialogImpl::NewSelectFileDialogImplGTK(
-    Listener* listener) {
-  return new SelectFileDialogImplGTK(listener);
+    Listener* listener, ui::SelectFilePolicy* policy) {
+  return new SelectFileDialogImplGTK(listener, policy);
 }
 
-SelectFileDialogImplGTK::SelectFileDialogImplGTK(Listener* listener)
-    : SelectFileDialogImpl(listener),
+SelectFileDialogImplGTK::SelectFileDialogImplGTK(Listener* listener,
+                                                 ui::SelectFilePolicy* policy)
+    : SelectFileDialogImpl(listener, policy),
       preview_(NULL) {
 }