Fall back to shortcut A2HS when Phonesky is out of date or unavailable.

chrome/browser/android/webapk/webapk_installer.cc

Index: chrome/browser/android/webapk/webapk_installer.cc
diff --git a/chrome/browser/android/webapk/webapk_installer.cc b/chrome/browser/android/webapk/webapk_installer.cc
index 161a3881865f2dd5aa258762a891f35d4ba10ac9..4d164ecb21537a828cd21fb99cff0bd1f656973a 100644
--- a/chrome/browser/android/webapk/webapk_installer.cc
+++ b/chrome/browser/android/webapk/webapk_installer.cc
@@ -427,10 +427,10 @@ void WebApkInstaller::OnURLFetchComplete(const net::URLFetcher* source) {
   if (CanUseGooglePlayInstallService()) {
     int version = 1;
     base::StringToInt(response->version(), &version);
-    if (!InstallOrUpdateWebApkFromGooglePlay(
-        response->package_name(), version, response->token())) {
-      OnFailure();
-    }
+    // TODO(hanxi): crbug.com/688759. Removes the return value of
+    // |InstallOrUpdateWebApkFromGooglePlay()| which is executed asynchronously.

[pkotwicz, 2017/02/05 02:13:55]

Nits:
"Removes" -> "Remove"
"|InstallOrUpdateWebApkFromGooglePlay()|" ->
"InstallOrUpdateWebApkFromGooglePlay()"
"which is" -> "is"

[Xi Han, 2017/02/06 18:03:44]

How about "Remove the return value of InstallOrUpdateWebApkFromGooglePlay(),
since a callback will be called after the install or update is either failed or
completed."?

[pkotwicz, 2017/02/06 23:12:12]

One small nit: "is either" -> "has either"
Otherwise looks good

[Xi Han, 2017/02/07 02:52:10]

Done.

+    InstallOrUpdateWebApkFromGooglePlay(
+        response->package_name(), version, response->token());
     return;
   }