mac: Fix os_exchange_data_provider_mac.mm.

ui/base/dragdrop/os_exchange_data.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_DRAGDROP_OS_EXCHANGE_DATA_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_H_
 
 #include "build/build_config.h"
 
 #include <set>
@@ skipping 172 matching lines @@
   // Full path to one or more files. See also SetFilenames() in Provider.
   void SetFilenames(
       const std::vector<FileInfo>& file_names);
   // Adds pickled data of the specified format.
   void SetPickledData(const CustomFormat& format, const base::Pickle& data);
 
   // These functions retrieve data of the specified type. If data exists, the
   // functions return and the result is in the out parameter. If the data does
   // not exist, the out parameter is not touched. The out parameter cannot be
   // NULL.
+  // GetString() returns the plain text representation of the pasteboard
+  // contents.
   bool GetString(base::string16* data) const;
   bool GetURLAndTitle(FilenameToURLPolicy policy,
                       GURL* url,
                       base::string16* title) const;
   // Return the path of a file, if available.
   bool GetFilename(base::FilePath* path) const;
   bool GetFilenames(
       std::vector<FileInfo>* file_names) const;
   bool GetPickledData(const CustomFormat& format, base::Pickle* data) const;
 
@@ skipping 31 matching lines @@
  private:
   // Provides the actual data.
   scoped_ptr<Provider> provider_;
 
   DISALLOW_COPY_AND_ASSIGN(OSExchangeData);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_H_