Clean up ReaderMode OverlayPanel classes

chrome/android/java/src/org/chromium/chrome/browser/dom_distiller/ReaderModeManagerDelegate.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.dom_distiller;
-
-import org.chromium.chrome.browser.ChromeActivity;
-import org.chromium.chrome.browser.compositor.bottombar.OverlayPanel.StateChangeReason;
-import org.chromium.content_public.browser.WebContents;
-
-/**
- * Delegate for the panel to call into the manager.
- */
-public interface ReaderModeManagerDelegate {
-    /**
-     * Load a URL in a new tab.
-     * @param url The URL to load in the tab.
-     */
-    void createNewTab(String url);
-
-    /**
-     * Notify the manager that the panel was actually shown.
-     */
-    void onPanelShown();
-
-    /**
-     * Notify the manager that the panel has completely closed.
-     */
-    void onClosed(StateChangeReason reason);
-
-    /**
-     * Get the WebContents of the page that is being distilled.
-     * @return The WebContents for the currently visible tab.
-     */
-    WebContents getBasePageWebContents();
-
-    /**
-     * Close the Reader Mode panel. This method wrap's the ReaderModePanel's close function and
-     * checks for null.
-     * @param reason The reason the panel is being closed.
-     * @param animate If the panel should animate as it closes.
-     */
-    void closeReaderPanel(StateChangeReason reason, boolean animate);
-
-    /**
-     * @return The ChromeActivity that owns the manager.
-     */
-    ChromeActivity getChromeActivity();
-
-    /**
-     * Record the amount of time that a user spent in the Reader Mode panel.
-     * @param timeInMs The amount of time spent in ms.
-     */
-    void recordTimeSpentInReader(long timeInMs);
-}