Rewrite AndroidSyncSettings to be significantly simpler.

chrome/android/java/src/org/chromium/chrome/browser/signin/AccountManagementFragment.java

Index: chrome/android/java/src/org/chromium/chrome/browser/signin/AccountManagementFragment.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/signin/AccountManagementFragment.java b/chrome/android/java/src/org/chromium/chrome/browser/signin/AccountManagementFragment.java
index 82de70c477f0926c520bf5277f0a5550d91f16bb..2c1399da15d135ef3bc7ef957724d49c9f74eb91 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/signin/AccountManagementFragment.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/signin/AccountManagementFragment.java
@@ -467,8 +467,7 @@ public class AccountManagementFragment extends PreferenceFragment
     }
 
     private static String getSyncStatusSummary(Activity activity) {
-        ChromeSigninController signinController = ChromeSigninController.get(activity);
-        if (!signinController.isSignedIn()) return "";
+        if (!ChromeSigninController.get(activity).isSignedIn()) return "";
 
         AndroidSyncSettings androidSyncSettings = AndroidSyncSettings.get(activity);
         ProfileSyncService profileSyncService = ProfileSyncService.get(activity);
@@ -504,7 +503,7 @@ public class AccountManagementFragment extends PreferenceFragment
             }
         }
 
-        return androidSyncSettings.isSyncEnabled(signinController.getSignedInUser())
+        return androidSyncSettings.isSyncEnabled()
                 ? res.getString(R.string.sync_is_enabled)
                 : res.getString(R.string.sync_is_disabled);
     }