[Android] Remove unused ARGUMENT_ACCOUNT from SyncCustomizationFragment

This CL removes ARGUMENT_ACCOUNT from SyncCustomizationFragment and
AccountManagementFragment. This was a fragment argument before
https://crrev.com/1239083007, but now it's not used and can be safely
removed.

Bug: 856182
Change-Id: Ib6ce0050b6222ef39fbf25fd280218af2c4051ba
Reviewed-on: https://chromium-review.googlesource.com/1114854Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570837}

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

@@ -269,10 +269,7 @@ public class AccountManagementFragment extends PreferenceFragment
 
             if (ProfileSyncService.get() == null) return true;
 
-            Bundle args = new Bundle();
-            args.putString(SyncCustomizationFragment.ARGUMENT_ACCOUNT, mSignedInAccountName);
-            preferences.startFragment(SyncCustomizationFragment.class.getName(), args);
-
+            preferences.startFragment(SyncCustomizationFragment.class.getName(), new Bundle());
             return true;
         });
     }

chrome/android/java/src/org/chromium/chrome/browser/sync/ui/SyncCustomizationFragment.java

@@ -108,8 +108,6 @@ public class SyncCustomizationFragment extends PreferenceFragment
     private static final int SYNC_CLIENT_OUT_OF_DATE = 3;
     private static final int SYNC_OTHER_ERRORS = 128;
 
-    public static final String ARGUMENT_ACCOUNT = "account";
-
     private ChromeSwitchPreference mSyncSwitchPreference;
     private boolean mIsEngineInitialized;
     private boolean mIsPassphraseRequired;