Add defaulted move constructors for some types that just got copy constructors

webrtc/base/pathutils.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 38 matching lines @@
 
 char Pathname::DefaultFolderDelimiter() {
   return DEFAULT_FOLDER_DELIM;
 }
 
 Pathname::Pathname()
     : folder_delimiter_(DEFAULT_FOLDER_DELIM) {
 }
 
 Pathname::Pathname(const Pathname&) = default;
+Pathname::Pathname(Pathname&&) = default;
 
 Pathname::Pathname(const std::string& pathname)
     : folder_delimiter_(DEFAULT_FOLDER_DELIM) {
   SetPathname(pathname);
 }
 
 Pathname::Pathname(const std::string& folder, const std::string& filename)
     : folder_delimiter_(DEFAULT_FOLDER_DELIM) {
   SetPathname(folder, filename);
 }
 
+Pathname& Pathname::operator=(const Pathname&) = default;
+Pathname& Pathname::operator=(Pathname&&) = default;
+
 void Pathname::SetFolderDelimiter(char delimiter) {
   ASSERT(IsFolderDelimiter(delimiter));
   folder_delimiter_ = delimiter;
 }
 
 void Pathname::Normalize() {
   for (size_t i=0; i<folder_.length(); ++i) {
     if (IsFolderDelimiter(folder_[i])) {
       folder_[i] = folder_delimiter_;
     }
@@ skipping 165 matching lines @@
   // sanity checking
   return (isalpha(drive[0]) &&
           drive[1] == ':' &&
           drive[2] == '\\');
 }
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
 
 } // namespace rtc