Remove unused AddGoogleAccountDialogFragment

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

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.chrome.browser.signin;
-
-import android.app.Dialog;
-import android.app.DialogFragment;
-import android.content.DialogInterface;
-import android.os.Bundle;
-import android.support.v7.app.AlertDialog;
-
-import org.chromium.chrome.R;
-
-/**
- * Fragment that allows user to add their Google account.
- */
-public class AddGoogleAccountDialogFragment extends DialogFragment implements
-        DialogInterface.OnClickListener {
-
-    /**
-     * Listener for new account additions.
-     */
-    public interface AddGoogleAccountListener {
-        /**
-         * Called when the user chooses to add an account to their device.
-         */
-        public void onAddAccountClicked();
-    }
-
-    private AddGoogleAccountListener mListener;
-
-    @Override
-    public Dialog onCreateDialog(Bundle savedInstanceState) {
-        return new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
-                .setTitle(R.string.add_account_title)
-                .setPositiveButton(R.string.add_account_continue, this)
-                .setNegativeButton(R.string.cancel, null)
-                .setMessage(R.string.add_account_message)
-                .create();
-    }
-
-    @Override
-    public void onClick(DialogInterface dialog, int which) {
-        if (which == AlertDialog.BUTTON_POSITIVE) {
-            if (mListener != null) mListener.onAddAccountClicked();
-        }
-    }
-
-    /**
-     * @param listener Listener that should be notified when user chooses to add an account.
-     */
-    public void setListener(AddGoogleAccountListener listener) {
-        mListener = listener;
-    }
-}