Enabling the "enable offline load stale cache" flag for ChromeOS

[email protected]
BUG=433388
TEST=manual

Review URL: https://codereview.chromium.org/734033003

Cr-Commit-Position: refs/heads/master@{#304513}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 42128af..cb0815a 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1295,7 +1295,7 @@
     "enable-offline-load-stale-cache",
     IDS_FLAGS_ENABLE_OFFLINE_LOAD_STALE_NAME,
     IDS_FLAGS_ENABLE_OFFLINE_LOAD_STALE_DESCRIPTION,
-    kOsLinux | kOsMac | kOsWin | kOsAndroid,
+    kOsAll,
     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOfflineLoadStaleCache,
                               switches::kDisableOfflineLoadStaleCache)
   },