[Home] Remove BottomSheetObservers that are no longer used

chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java

 // Copyright 2017 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.widget.bottomsheet;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
@@ skipping 1042 matching lines @@
 
     /**
      * Adds an observer to the bottom sheet.
      * @param observer The observer to add.
      */
     public void addObserver(BottomSheetObserver observer) {
         mObservers.addObserver(observer);
     }
 
     /**
+     * Removes an observer to the bottom sheet.
+     * @param observer The observer to remove.
+     */
+    public void removeObserver(BottomSheetObserver observer) {
+        mObservers.removeObserver(observer);
+    }
+
+    /**
      * Gets the target state of the sheet based on the sheet's height and velocity.
      * @param sheetHeight The current height of the sheet.
      * @param yVelocity The current Y velocity of the sheet. This is only used for determining the
      *                  scroll or fling direction. If this value is positive, the movement is from
      *                  bottom to top.
      * @return The target state of the bottom sheet.
      */
     @SheetState
     private int getTargetSheetState(float sheetHeight, float yVelocity) {
         if (sheetHeight <= getMinOffset()) return SHEET_STATE_PEEK;
@@ skipping 81 matching lines @@
                 getContext(), mControlContainer, R.string.bottom_sheet_help_bubble_message);
         int inset = getContext().getResources().getDimensionPixelSize(
                 R.dimen.bottom_sheet_help_bubble_inset);
         helpBubble.setInsetPx(0, inset, 0, inset);
         helpBubble.setDismissOnTouchInteraction(true);
         helpBubble.show();
 
         preferences.edit().putBoolean(BOTTOM_SHEET_HELP_BUBBLE_SHOWN, true).apply();
     }
 }