Reland of Don't bother running realpath in DeviceUtils._GetChangedAndStaleFiles()

tools/android/md5sum/md5sum.cc

 // 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.
 
 // Md5sum implementation for Android. This version handles files as well as
 // directories. Its output is sorted by file path.
 
 #include <fstream>
 #include <iostream>
 #include <set>
@@ skipping 38 matching lines @@
   std::set<std::string> file_set;
   for (const char** file = files; *file; ++file) {
     base::FilePath file_path(*file);
     if (base::DirectoryExists(file_path)) {
       base::FileEnumerator file_enumerator(
           file_path, true /* recurse */, base::FileEnumerator::FILES);
       for (base::FilePath child, empty;
            (child = file_enumerator.Next()) != empty; ) {
         // If the path contains /.svn/, ignore it.
         if (child.value().find(svn_dir_component) == std::string::npos) {
-          child = base::MakeAbsoluteFilePath(child);
           file_set.insert(child.value());
         }
       }
     } else {
       file_set.insert(*file);
     }
   }
   return file_set;
 }
 
 }  // namespace
 
 int main(int argc, const char* argv[]) {
   if (argc < 2) {
     LOG(ERROR) << "Usage: md5sum <path/to/file_or_dir>...";
     return 1;
   }
   const std::set<std::string> files = MakeFileSet(argv + 1);
   bool failed = false;
   std::string digest;
   for (std::set<std::string>::const_iterator it = files.begin();
        it != files.end(); ++it) {
     if (!MD5Sum(it->c_str(), &digest)) {
       failed = true;
     } else {
-      base::FilePath file_path(*it);
-      std::cout << digest << "  "
-                << base::MakeAbsoluteFilePath(file_path).value() << std::endl;
+      std::cout << digest << "  " << *it << std::endl;
     }
   }
   return failed;
 }