base: Use std::move() instead of Pass() for real movable types.

base/environment.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.
 
 #include "base/environment.h"
 
 #include <vector>
 
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
@@ skipping 210 matching lines @@
   char* storage_data = reinterpret_cast<char*>(
       &result.get()[result_indices.size() + 1]);
   if (!value_storage.empty())
     memcpy(storage_data, value_storage.data(), value_storage.size());
 
   // Fill array of pointers at the beginning of the result.
   for (size_t i = 0; i < result_indices.size(); i++)
     result[i] = &storage_data[result_indices[i]];
   result[result_indices.size()] = 0;  // Null terminator.
 
-  return result.Pass();
+  return result;
 }
 
 #endif  // OS_POSIX
 
 }  // namespace base