Remove the unused CipherKeyActivity

chrome/android/java/src/org/chromium/chrome/browser/document/CipherKeyActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/document/CipherKeyActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/document/CipherKeyActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/document/CipherKeyActivity.java
deleted file mode 100644
index 0302290b385742054e392c1eecb70fcbee141889..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/org/chromium/chrome/browser/document/CipherKeyActivity.java
+++ /dev/null
@@ -1,74 +0,0 @@
-// 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.document;
-
-import android.app.Activity;
-import android.content.Context;
-import android.content.Intent;
-import android.os.Bundle;
-
-import org.chromium.content.browser.crypto.CipherFactory;
-
-/**
- * An activity responsible for retaining the incognito cipher key for the duration of an incognito
- * session. The activity gets brought forward for two reasons: to restore the cipher key before a
- * new incognito window is launched or to save the current cipher key. If brought forward to
- * restore, the activity is passed an intent and options to call after the restore process is
- * complete. Otherwise the activity just puts itself in background causing onSaveInstanceState to
- * get called and save the cipher keys to the activity's bundle.
- */
-public class CipherKeyActivity extends Activity {
-
-    /**
-     * An intent name for specifying the next intent to invoke.
-     */
-    public static final String FORWARD_INTENT = "forward_intent";
-
-    /**
-     * An options Bundle to use with intent specified by "forward_intent".
-     */
-    public static final String FORWARD_OPTIONS = "forward_options";
-
-    /**
-     * Generates an intent to {@link CipherKeyActivity} to restore cipher keys from the bundle
-     * if possible.
-     * @param context The context to use.
-     * @param forwardIntent The intent cipher key activity will call when it's done.
-     * @param options The options to pass into startActivity call of the forward intent.
-     * @return The intent.
-     */
-    public static Intent createIntent(Context context, Intent forwardIntent, Bundle options) {
-        Intent intent = new Intent(context, CipherKeyActivity.class);
-        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-        if (forwardIntent != null) intent.putExtra(FORWARD_INTENT, forwardIntent);
-        if (options != null) intent.putExtra(FORWARD_OPTIONS, options);
-        return intent;
-    }
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        if (savedInstanceState != null) {
-            CipherFactory.getInstance().restoreFromBundle(savedInstanceState);
-        }
-        Intent nextIntent = (Intent) getIntent().getParcelableExtra(FORWARD_INTENT);
-        if (nextIntent != null) {
-            startActivity(nextIntent, (Bundle) getIntent().getParcelableExtra(FORWARD_OPTIONS));
-        }
-    }
-
-    @Override
-    public void onResume() {
-        super.onResume();
-        moveTaskToBack(true);
-    }
-
-    @Override
-    protected void onSaveInstanceState(Bundle outState) {
-        super.onSaveInstanceState(outState);
-        CipherFactory.getInstance().saveToBundle(outState);
-    }
-
-}