[Home] Remove BottomSheetObservers that are no longer used

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

Index: chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java b/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
index ede7e626e835e6cc31653b71692edf5e9def8100..3c7903a433ff7db45546e914aa3b0e0ff3268ba5 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
@@ -1060,6 +1060,14 @@ public class BottomSheet
     }
 
     /**
+     * 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