[Signin] Prepare to remove use of deprecated AMH method in VariationsSerssion.

sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java

Index: sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java
diff --git a/sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java b/sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java
index fc579d7f519b74181686a00fabaeee224cd79a6d..7e8e205ecb555294f940c048ea93faaa90338730 100644
--- a/sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java
+++ b/sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java
@@ -279,9 +279,7 @@ public class AccountManagerHelper {
     }
 
     /**
-     * This method is deprecated; please use the asynchronous version below instead.
-     *
-     * See http://crbug.com/517697 for details.
+     * @return Whether or not there is an account authenticator for Google accounts.
      */
     public boolean hasGoogleAccountAuthenticator() {
         AuthenticatorDescription[] descs = mAccountManager.getAuthenticatorTypes();