Make ScopedGeneric uses slightly more consistent

client/settings.h

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 13 matching lines @@
 #include "base/scoped_generic.h"
 #include "util/file/file_io.h"
 #include "util/misc/initialization_state.h"
 #include "util/misc/uuid.h"
 
 namespace crashpad {
 
 namespace internal {
 
 struct ScopedLockedFileHandleTraits {
-  static FileHandle InvalidValue();
+  static FileHandle InvalidValue() { return kInvalidFileHandle; }
   static void Free(FileHandle handle);
 };
 
 }  // namespace internal
 
 //! \brief An interface for accessing and modifying the settings of a
 //!     CrashReportDatabase.
 //!
 //! This class must not be instantiated directly, but rather an instance of it
 //! should be retrieved via CrashReportDatabase::GetSettings().
@@ skipping 129 matching lines @@
   base::FilePath file_path_;
 
   InitializationState initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(Settings);
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_CLIENT_SETTINGS_H_