ui/shell_dialogs: Use base::string16 now that string16 was moved into base namespace.

ui/shell_dialogs/select_file_dialog_mac.mm

 // 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 "ui/shell_dialogs/select_file_dialog.h"
 
 #import <Cocoa/Cocoa.h>
 #include <CoreServices/CoreServices.h>
 
 #include <map>
@@ skipping 65 matching lines @@
                        const std::vector<base::FilePath>& files,
                        int index);
 
   bool ShouldEnableFilename(NSSavePanel* dialog, NSString* filename);
 
  protected:
   // SelectFileDialog implementation.
   // |params| is user data we pass back via the Listener interface.
   virtual void SelectFileImpl(
       Type type,
-      const string16& title,
+      const base::string16& title,
       const base::FilePath& default_path,
       const FileTypeInfo* file_types,
       int file_type_index,
       const base::FilePath::StringType& default_extension,
       gfx::NativeWindow owning_window,
       void* params) OVERRIDE;
 
  private:
   virtual ~SelectFileDialogImpl();
 
@@ skipping 67 matching lines @@
                                                 NSString* filename) {
   // If this is a single open file dialog, disable selecting packages.
   if (type_map_[dialog] != SELECT_OPEN_FILE)
     return true;
 
   return ![[NSWorkspace sharedWorkspace] isFilePackageAtPath:filename];
 }
 
 void SelectFileDialogImpl::SelectFileImpl(
     Type type,
-    const string16& title,
+    const base::string16& title,
     const base::FilePath& default_path,
     const FileTypeInfo* file_types,
     int file_type_index,
     const base::FilePath::StringType& default_extension,
     gfx::NativeWindow owning_window,
     void* params) {
   DCHECK(type == SELECT_FOLDER ||
          type == SELECT_OPEN_FILE ||
          type == SELECT_OPEN_MULTI_FILE ||
          type == SELECT_SAVEAS_FILE);
@@ skipping 234 matching lines @@
 
 namespace ui {
 
 SelectFileDialog* CreateMacSelectFileDialog(
     SelectFileDialog::Listener* listener,
     SelectFilePolicy* policy) {
   return new SelectFileDialogImpl(listener, policy);
 }
 
 }  // namespace ui