[Android] Fix a bug that snackbar does not show when there is no tab on tablet

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.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;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.SearchManager;
@@ skipping 43 matching lines @@
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.IntentHandler.IntentHandlerDelegate;
 import org.chromium.chrome.browser.IntentHandler.TabOpenType;
 import org.chromium.chrome.browser.appmenu.AppMenu;
 import org.chromium.chrome.browser.appmenu.AppMenuHandler;
 import org.chromium.chrome.browser.appmenu.AppMenuObserver;
 import org.chromium.chrome.browser.appmenu.AppMenuPropertiesDelegate;
-import org.chromium.chrome.browser.bookmarks.BookmarkBridge.BookmarkModelObserver;
 import org.chromium.chrome.browser.bookmarks.BookmarkModel;
 import org.chromium.chrome.browser.bookmarks.BookmarkUtils;
 import org.chromium.chrome.browser.compositor.CompositorViewHolder;
 import org.chromium.chrome.browser.compositor.layouts.Layout;
 import org.chromium.chrome.browser.compositor.layouts.LayoutManager;
 import org.chromium.chrome.browser.compositor.layouts.LayoutManagerDocument;
 import org.chromium.chrome.browser.compositor.layouts.SceneChangeObserver;
 import org.chromium.chrome.browser.compositor.layouts.content.ContentOffsetProvider;
 import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
 import org.chromium.chrome.browser.contextualsearch.ContextualSearchFieldTrial;
@@ skipping 138 matching lines @@
     private ChromeFullscreenManager mFullscreenManager;
     private CompositorViewHolder mCompositorViewHolder;
     private InsetObserverView mInsetObserverView;
     private ContextualSearchManager mContextualSearchManager;
     private ReaderModeManager mReaderModeManager;
     private SnackbarManager mSnackbarManager;
     private DataUseSnackbarController mDataUseSnackbarController;
     private AppMenuPropertiesDelegate mAppMenuPropertiesDelegate;
     private AppMenuHandler mAppMenuHandler;
     private ToolbarManager mToolbarManager;
-    private BookmarkModelObserver mBookmarkObserver;
 
     // Time in ms that it took took us to inflate the initial layout
     private long mInflateInitialLayoutDurationMs;
 
     private int mScreenWidthDp;
     private Runnable mRecordMultiWindowModeScreenWidthRunnable;
 
     private AssistStatusHandler mAssistStatusHandler;
 
     // A set of views obscuring all tabs. When this set is nonempty,
@@ skipping 1591 matching lines @@
                 "Android.MultiWindowMode.IsTabletScreenWidthBelow600",
                 mScreenWidthDp < DeviceFormFactor.MINIMUM_TABLET_WIDTH_DP);
 
         if (mScreenWidthDp < DeviceFormFactor.MINIMUM_TABLET_WIDTH_DP) {
             RecordHistogram.recordLinearCountHistogram(
                     "Android.MultiWindowMode.TabletScreenWidth", mScreenWidthDp, 1,
                     DeviceFormFactor.MINIMUM_TABLET_WIDTH_DP, 50);
         }
     }
 }