Revert "Changed NavigationController access to through tab in Java code"

chrome/android/java/src/org/chromium/chrome/browser/navigation/NavigationHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/navigation/NavigationHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/navigation/NavigationHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/navigation/NavigationHandler.java
deleted file mode 100644
index 718f66dd3cbddec6661f2cc5904a47bc63481a1b..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/org/chromium/chrome/browser/navigation/NavigationHandler.java
+++ /dev/null
@@ -1,161 +0,0 @@
-// Copyright 2016 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.navigation;
-
-import android.support.annotation.VisibleForTesting;
-
-import org.chromium.content_public.browser.LoadUrlParams;
-import org.chromium.content_public.browser.NavigationEntry;
-import org.chromium.content_public.browser.NavigationHistory;
-
-/**
- * Responsible for managing back-forward navigation for a tab. This interface enables the Chrome
- * layer to interact with different types of navigation controllers from multiple sources.
- */
-public interface NavigationHandler {
-    boolean canGoBack();
-
-    /**
-     * @return Whether forward navigation is possible from the "current entry".
-     */
-    boolean canGoForward();
-
-    /**
-     * @param offset The offset into the navigation history.
-     * @return Whether we can move in history by given offset
-     */
-    boolean canGoToOffset(int offset);
-
-    /**
-     * Navigates to the specified offset from the "current entry". Does nothing if the offset is
-     * out of bounds.
-     * @param offset The offset into the navigation history.
-     */
-    void goToOffset(int offset);
-
-    /**
-     * Navigates to the specified index in the navigation entry for this page.
-     * @param index The navigation index to navigate to.
-     */
-    void goToNavigationIndex(int index);
-
-    /**
-     * Goes to the navigation entry before the current one.
-     */
-    void goBack();
-
-    /**
-     * Goes to the navigation entry following the current one.
-     */
-    void goForward();
-
-    /**
-     * @return Whether the tab is navigating to the URL the tab is opened with.
-     */
-    boolean isInitialNavigation();
-
-    /**
-     * Loads the current navigation if there is a pending lazy load (after tab restore).
-     */
-    public void loadIfNecessary();
-
-    /**
-     * Requests the current navigation to be loaded upon the next call to loadIfNecessary().
-     */
-    public void requestRestoreLoad();
-
-    /**
-     * Reload the current page.
-     */
-    public void reload(boolean checkForRepost);
-
-    /**
-     * Reload the current page to refresh page contents, may not revalidate the cache contents.
-     */
-    public void reloadToRefreshContent(boolean checkForRepost);
-
-    /**
-     * Reload the current page, bypassing the contents of the cache.
-     */
-    public void reloadBypassingCache(boolean checkForRepost);
-
-    /**
-     * Reload the current page with Lo-Fi off, ignoring the contents of the cache.
-     */
-    public void reloadDisableLoFi(boolean checkForRepost);
-
-    /**
-     * Cancel the pending reload.
-     */
-    public void cancelPendingReload();
-
-    /**
-     * Continue the pending reload.
-     */
-    public void continuePendingReload();
-
-    /**
-     * Load url without fixing up the url string. Consumers of NavigationController are
-     * responsible for ensuring the URL passed in is properly formatted (i.e. the
-     * scheme has been added if left off during user input).
-     * @param params Parameters for this load.
-     */
-    public void loadUrl(LoadUrlParams params);
-
-    /**
-    * Get the navigation history of NavigationController from current navigation entry index
-    * with direction (forward/backward)
-    * @param isForward determines forward or backward from current index
-    * @param itemLimit maximum number of entries to be retrieved in specified
-    * diection.
-    * @return navigation history by keeping above constraints.
-    */
-    public NavigationHistory getDirectedNavigationHistory(boolean isForward, int itemLimit);
-
-    /**
-     * Get Original URL for current Navigation entry of NavigationController.
-     * @return The original request URL for the current navigation entry, or null if there is no
-     *         current entry.
-     */
-    public String getOriginalUrlForVisibleNavigationEntry();
-
-    /**
-     * Clears SSL preferences for this NavigationController.
-     */
-    public void clearSslPreferences();
-
-    /**
-     * Get whether or not we're using a desktop user agent for the currently loaded page.
-     * @return true, if use a desktop user agent and false for a mobile one.
-     */
-    public boolean getUseDesktopUserAgent();
-
-    /**
-     * Set whether or not we're using a desktop user agent for the currently loaded page.
-     * @param override If true, use a desktop user agent.  Use a mobile one otherwise.
-     * @param reloadOnChange Reload the page if the UA has changed.
-     */
-    public void setUseDesktopUserAgent(boolean override, boolean reloadOnChange);
-
-    /**
-     * Return the NavigationEntry at the given index.
-     * @param index Index to retrieve the NavigationEntry for.
-     * @return Entry containing info about the navigation, null if the index is out of bounds.
-     */
-    @VisibleForTesting
-    public NavigationEntry getEntryAtIndex(int index);
-
-    /**
-     * @return The index of the last committed entry.
-     */
-    public int getLastCommittedEntryIndex();
-
-    /**
-     * Removes the entry at the specified |index|.
-     * @return false, if the index is the last committed index or the pending entry. Otherwise this
-     *         call discards any transient or pending entries.
-     */
-    public boolean removeEntryAtIndex(int index);
-}