Make base::FilePath move constructor and assignment noexcept.

base/files/file_path.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/files/file_path.h"
 
 #include <string.h>
 #include <algorithm>
 
 #include "base/logging.h"
@@ skipping 156 matching lines @@
   return false;
 }
 
 }  // namespace
 
 FilePath::FilePath() {
 }
 
 FilePath::FilePath(const FilePath& that) : path_(that.path_) {
 }
-FilePath::FilePath(FilePath&& that) = default;
+FilePath::FilePath(FilePath&& that) noexcept = default;
 
 FilePath::FilePath(StringPieceType path) {
   path.CopyToString(&path_);
   StringType::size_type nul_pos = path_.find(kStringTerminator);
   if (nul_pos != StringType::npos)
     path_.erase(nul_pos, StringType::npos);
 }
 
 FilePath::~FilePath() {
 }
@@ skipping 1148 matching lines @@
 #endif
 }
 
 #if defined(OS_ANDROID)
 bool FilePath::IsContentUri() const {
   return StartsWith(path_, "content://", base::CompareCase::INSENSITIVE_ASCII);
 }
 #endif
 
 }  // namespace base