Convert string16 to base::string16 in content.

content/public/common/file_chooser_params.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 CONTENT_PUBLIC_COMMON_FILE_CHOOSER_PARAMS_H_
 #define CONTENT_PUBLIC_COMMON_FILE_CHOOSER_PARAMS_H_
 
 #include <vector>
 
 #include "base/files/file_path.h"
@@ skipping 19 matching lines @@
 
     // Allows picking a nonexistent file, and prompts to overwrite if the file
     // already exists.
     Save,
   };
 
   Mode mode;
 
   // Title to be used for the dialog. This may be empty for the default title,
   // which will be either "Open" or "Save" depending on the mode.
-  string16 title;
+  base::string16 title;
 
   // Default file name to select in the dialog.
   base::FilePath default_file_name;
 
   // A list of valid lower-cased MIME types or file extensions specified in an
   // input element. It is used to restrict selectable files to such types.
-  std::vector<string16> accept_types;
+  std::vector<base::string16> accept_types;
 
 #if defined(OS_ANDROID)
   // See http://www.w3.org/TR/html-media-capture for more information.
   // If true, the data should be obtained using the device's camera/mic/etc.
   bool capture;
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_FILE_CHOOSER_PARAMS_H_