Revert "Support toggling Taskbar All Apps with 3P Launcher."

This reverts commit 176f186a6d.

Reason for revert: DroidMonitor: Potential culprit for http://b/331438065 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: Ie375277ad2f65199749f0211ab50037d4b37e664
Merged-In: Ie375277ad2f65199749f0211ab50037d4b37e664

quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java

@@ -1558,13 +1558,4 @@ public class TaskbarActivityContext extends BaseTaskbarContext {
     public float getStashedTaskbarScale() {
         return mControllers.stashedHandleViewController.getStashedHandleHintScale().value;
     }
-
-    /** Closes the KeyboardQuickSwitchView without an animation if open. */
-    public void closeKeyboardQuickSwitchView() {
-        mControllers.keyboardQuickSwitchController.closeQuickSwitchView(false);
-    }
-
-    boolean canToggleHomeAllApps() {
-        return mControllers.uiController.canToggleHomeAllApps();
-    }
 }