Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/src/google/protobuf/testing/file.cc

 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
+// http://code.google.com/p/protobuf/
 //
 // 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.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
@@ skipping 61 matching lines @@
 
   int error = ferror(file);
   if (fclose(file) != 0) return false;
   return error == 0;
 }
 
 void File::ReadFileToStringOrDie(const string& name, string* output) {
   GOOGLE_CHECK(ReadFileToString(name, output)) << "Could not read: " << name;
 }
 
-bool File::WriteStringToFile(const string& contents, const string& name) {
-  FILE* file = fopen(name.c_str(), "wb");
-  if (file == NULL) {
-    GOOGLE_LOG(ERROR) << "fopen(" << name << ", \"wb\"): " << strerror(errno);
-    return false;
-  }
-
-  if (fwrite(contents.data(), 1, contents.size(), file) != contents.size()) {
-    GOOGLE_LOG(ERROR) << "fwrite(" << name << "): " << strerror(errno);
-    return false;
-  }
-
-  if (fclose(file) != 0) {
-    return false;
-  }
-  return true;
-}
-
 void File::WriteStringToFileOrDie(const string& contents, const string& name) {
   FILE* file = fopen(name.c_str(), "wb");
   GOOGLE_CHECK(file != NULL)
       << "fopen(" << name << ", \"wb\"): " << strerror(errno);
   GOOGLE_CHECK_EQ(fwrite(contents.data(), 1, contents.size(), file),
                   contents.size())
       << "fwrite(" << name << "): " << strerror(errno);
   GOOGLE_CHECK(fclose(file) == 0)
       << "fclose(" << name << "): " << strerror(errno);
 }
@@ skipping 13 matching lines @@
     // No parent given.
     return false;
   }
 
   return RecursivelyCreateDir(path.substr(0, slashpos), mode) &&
          CreateDir(path, mode);
 }
 
 void File::DeleteRecursively(const string& name,
                              void* dummy1, void* dummy2) {
-  if (name.empty()) return;
-
   // We don't care too much about error checking here since this is only used
   // in tests to delete temporary directories that are under /tmp anyway.
 
 #ifdef _MSC_VER
   // This interface is so weird.
   WIN32_FIND_DATA find_data;
   HANDLE find_handle = FindFirstFile((name + "/*").c_str(), &find_data);
   if (find_handle == INVALID_HANDLE_VALUE) {
     // Just delete it, whatever it is.
     DeleteFile(name.c_str());
@@ skipping 37 matching lines @@
 
     closedir(dir);
     rmdir(name.c_str());
 
   } else if (S_ISREG(stats.st_mode)) {
     remove(name.c_str());
   }
 #endif
 }
 
-bool File::ChangeWorkingDirectory(const string& new_working_directory) {
-  return chdir(new_working_directory.c_str()) == 0;
-}
-
 }  // namespace protobuf
 }  // namespace google