Enable chrome://discards on Linux.

chrome/common/url_constants.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 "chrome/common/url_constants.h"
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "build/build_config.h"
@@ skipping 132 matching lines @@
 const char kChromeUIWebRtcLogsURL[] = "chrome://webrtc-logs/";
 #endif
 
 #if defined(ENABLE_MEDIA_ROUTER)
 const char kChromeUIMediaRouterURL[] = "chrome://media-router/";
 #if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_CHROMEOS)
 const char kChromeUICastURL[] = "chrome://cast/";
 #endif
 #endif
 
-#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_CHROMEOS)
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
 const char kChromeUIDiscardsHost[] = "discards";
 const char kChromeUIDiscardsURL[] = "chrome://discards/";
 #endif
 
 // Add Chrome UI hosts here, in alphabetical order.
 // Add hosts to kChromePaths in browser_about_handler.cc to be listed by
 // chrome://chrome-urls (about:about) and the built-in AutocompleteProvider.
 const char kChromeUIAboutHost[] = "about";
 const char kChromeUIBlankHost[] = "blank";
 const char kChromeUIAppLauncherPageHost[] = "apps";
@@ skipping 630 matching lines @@
 #endif
 
 const char kChooserUsbOverviewURL[] =
     "https://support.google.com/chrome?p=webusb";
 
 #if defined(OS_CHROMEOS)
 const char kEolNotificationURL[] = "https://www.google.com/chromebook/older/";
 #endif
 
 }  // namespace chrome