Add memory ablation experiment.

chrome/browser/flag_descriptions.h

 // Copyright 2017 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.
 
 #ifndef CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 #define CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 
 // Includes needed for macros allowing conditional compilation of some strings.
 #include "build/build_config.h"
 #include "build/buildflag.h"
@@ skipping 3015 matching lines @@
 
 // Title for the flag to delay navigation
 extern const char kDelayNavigationName[];
 
 // Description for the flag to delay navigation
 extern const char kDelayNavigationDescription[];
 
 // Description of the 'Debugging keyboard shortcuts' lab.
 extern const char kDebugShortcutsDescription[];
 
+extern const char kMemoryAblationName[];
+extern const char kMemoryAblationDescription[];
+
 #if defined(OS_ANDROID)
 
 // Name for the flag to enable the custom context menu.
 extern const char kEnableCustomContextMenuName[];
 
 // Description for the flag to enable the custom context menu.
 extern const char kEnableCustomContextMenuDescription[];
 
 #endif  // defined(OS_ANDROID)
 
@@ skipping 183 matching lines @@
 extern const char kEnableCopylessPasteName[];
 
 // Description of the flag that enables Copyless Paste.
 extern const char kEnableCopylessPasteDescription[];
 
 #endif  // defined(OS_ANDROID)
 
 }  // namespace flag_descriptions
 
 #endif  // CHROME_BROWSER_FLAG_DESCRIPTIONS_H_