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

ui/base/dialogs/gtk/select_file_dialog_impl.h

 // 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.
 //
 // This file implements common select dialog functionality between GTK and KDE.
 
 #ifndef UI_BASE_DIALOGS_GTK_SELECT_FILE_DIALOG_IMPL_H_
 #define UI_BASE_DIALOGS_GTK_SELECT_FILE_DIALOG_IMPL_H_
 
 #include <set>
@@ skipping 19 matching lines @@
 
   // Returns true if the SelectFileDialog class returned by
   // NewSelectFileDialogImplKDE will actually work.
   static bool CheckKDEDialogWorksOnUIThread();
 
   // BaseShellDialog implementation.
   virtual bool IsRunning(gfx::NativeWindow parent_window) const OVERRIDE;
   virtual void ListenerDestroyed() OVERRIDE;
 
  protected:
-  explicit SelectFileDialogImpl(Listener* listener,
-                                ui::SelectFilePolicy* policy);
+  SelectFileDialogImpl(Listener* listener,
+                       ui::SelectFilePolicy* policy);
   virtual ~SelectFileDialogImpl();
 
   // 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,
                               int file_type_index,
                               const FilePath::StringType& default_extension,
@@ skipping 27 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SelectFileDialogImpl);
 };
 
 SelectFileDialog* CreateLinuxSelectFileDialog(
     SelectFileDialog::Listener* listener,
     SelectFilePolicy* policy);
 
 }  // namespace ui
 
 #endif  // UI_BASE_DIALOGS_GTK_SELECT_FILE_DIALOG_IMPL_H_