Make base::FilePath move constructor and assignment noexcept.

base/files/file_path.h

 // 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.
 
 // FilePath is a container for pathnames stored in a platform's native string
 // type, providing containers for manipulation in according with the
 // platform's conventions for pathnames.  It supports the following path
 // types:
 //
 //                   POSIX            Windows
@@ skipping 166 matching lines @@
   static const CharType kExtensionSeparator;
 
   FilePath();
   FilePath(const FilePath& that);
   explicit FilePath(StringPieceType path);
   ~FilePath();
   FilePath& operator=(const FilePath& that);
 
   // Constructs FilePath with the contents of |that|, which is left in valid but
   // unspecified state.
-  FilePath(FilePath&& that);
+  FilePath(FilePath&& that) noexcept;
   // Replaces the contents with those of |that|, which is left in valid but
   // unspecified state.
   FilePath& operator=(FilePath&& that);
 
   bool operator==(const FilePath& that) const;
 
   bool operator!=(const FilePath& that) const;
 
   // Required for some STL containers and operations
   bool operator<(const FilePath& that) const {
@@ skipping 279 matching lines @@
 template<>
 struct hash<base::FilePath> {
   size_t operator()(const base::FilePath& f) const {
     return hash<base::FilePath::StringType>()(f.value());
   }
 };
 
 }  // namespace BASE_HASH_NAMESPACE
 
 #endif  // BASE_FILES_FILE_PATH_H_