WebApps: Re-enable web app manifest updating

This CL re-enables updating for web app manifests targeting 79.

Bug: 926083
Change-Id: Id94c2d74d833a3d9a7d7fbe857018ac4827657b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831661Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701432}

chrome/common/chrome_features.cc

@@ -249,8 +249,8 @@ const base::Feature kDesktopPWAsCacheDuringDefaultInstall{
 
 // Enables local PWA installs to update their app manifest data if the site
 // changes its manifest.
-const base::Feature kDesktopPWAsLocalUpdating{
-    "DesktopPWAsLocalUpdating", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kDesktopPWAsLocalUpdating{"DesktopPWAsLocalUpdating",
+                                              base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables use of new Desktop PWAs browser controller (that uses the
 // universal web_app::AppRegistrar) by extensions-based bookmark apps. Note that