This fixes a number of things that are warnings in the Mac compiler....

import/cross/raw_data.cc

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 378 matching lines @@
   if (!file_util::GetTempDir(&temp_path)) {
     return false;
   }
 
   String uuid_string = GetUUIDString();
 
   // format the temp file basename
   String filename;
 
   // try to retain the original file suffix (.jpg, etc.)
-  int dot_position = uri.rfind('.');
+  std::string::size_type dot_position = uri.rfind('.');
   if (dot_position != std::string::npos) {
     filename = uuid_string + uri.substr(dot_position);
   } else {
     filename = uuid_string;
   }
 
   // Construct the full pathname
   FilePath fullpath = temp_path;
   fullpath = fullpath.AppendASCII(filename);
 
   if (temp_fullpath) *temp_fullpath = fullpath;
 
   return true;
 }
 
 }  // namespace o3d