Add missing (and remove superfluous) 'explicit' from constructors.

ui/base/dialogs/gtk/select_file_dialog_impl_gtk.cc

 // Copyright (c) 2012 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 <gtk/gtk.h>
 #include <map>
 #include <set>
 #include <vector>
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "grit/ui_strings.h"
 #include "ui/base/dialogs/gtk/select_file_dialog_impl.h"
 #include "ui/base/dialogs/select_file_dialog.h"
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace {
 
 // Implementation of SelectFileDialog that shows a Gtk common dialog for
 // choosing a file or folder. This acts as a modal dialog.
 class SelectFileDialogImplGTK : public ui::SelectFileDialogImpl {
  public:
-  explicit SelectFileDialogImplGTK(Listener* listener,
-                                   ui::SelectFilePolicy* policy);
+  SelectFileDialogImplGTK(Listener* listener,
+                          ui::SelectFilePolicy* policy);
 
  protected:
   virtual ~SelectFileDialogImplGTK();
 
   // SelectFileDialog implementation.
   // |params| is user data we pass back via the Listener interface.
   virtual void SelectFileImpl(Type type,
                               const string16& title,
                               const FilePath& default_path,
                               const FileTypeInfo* file_types,
@@ skipping 511 matching lines @@
 }  // namespace
 
 namespace ui {
 
 SelectFileDialogImpl* SelectFileDialogImpl::NewSelectFileDialogImplGTK(
     Listener* listener, ui::SelectFilePolicy* policy) {
   return new SelectFileDialogImplGTK(listener, policy);
 }
 
 }  // namespace ui