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

ui/base/dialogs/select_file_dialog.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.
 
 #ifndef UI_BASE_DIALOGS_SELECT_FILE_DIALOG_H_
 #define UI_BASE_DIALOGS_SELECT_FILE_DIALOG_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 140 matching lines @@
                   const FilePath& default_path,
                   const FileTypeInfo* file_types,
                   int file_type_index,
                   const FilePath::StringType& default_extension,
                   gfx::NativeWindow owning_window,
                   void* params);
   bool HasMultipleFileTypeChoices();
 
  protected:
   friend class base::RefCountedThreadSafe<SelectFileDialog>;
-  explicit SelectFileDialog(Listener* listener,
-                            ui::SelectFilePolicy* policy);
+  SelectFileDialog(Listener* listener,
+                   ui::SelectFilePolicy* policy);
   virtual ~SelectFileDialog();
 
   // Displays the actual file-selection dialog.
   // This is overridden in the platform-specific descendants of FileSelectDialog
   // and gets called from SelectFile after testing the
   // AllowFileSelectionDialogs-Policy.
   virtual void SelectFileImpl(Type type,
                               const string16& title,
                               const FilePath& default_path,
                               const FileTypeInfo* file_types,
@@ skipping 19 matching lines @@
   virtual bool HasMultipleFileTypeChoicesImpl() = 0;
 
   scoped_ptr<ui::SelectFilePolicy> select_file_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(SelectFileDialog);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_DIALOGS_SELECT_FILE_DIALOG_H_