Revert "Moving taskbar lifecycle to TouchInteractionService"

This reverts commit e215fb730bb3d4a357a2c4bf0c082d3c0ad69495.

Reason for revert: DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/tests/view?invocationId=I13700009003387451&testResultId=TR89423459137251402, bug https://buganizer.corp.google.com/issues/188755902

Bug: 188755902
Change-Id: I4650136975b60f311499ee6ff5b27ab9a32d23d6
diff --git a/quickstep/res/layout/taskbar.xml b/quickstep/res/layout/taskbar.xml
index c436221..240fe55 100644
--- a/quickstep/res/layout/taskbar.xml
+++ b/quickstep/res/layout/taskbar.xml
@@ -22,29 +22,9 @@
 
     <com.android.launcher3.taskbar.TaskbarView
         android:id="@+id/taskbar_view"
-        android:layout_width="match_parent"
+        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:gravity="center"
-        android:forceHasOverlappingRendering="false"
-        android:layout_gravity="bottom" >
-
-        <LinearLayout
-            android:id="@+id/system_button_layout"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:paddingLeft="@dimen/taskbar_nav_buttons_spacing"
-            android:paddingRight="@dimen/taskbar_nav_buttons_spacing"
-            android:forceHasOverlappingRendering="false"
-            android:gravity="center" />
-
-        <LinearLayout
-            android:id="@+id/hotseat_icons_layout"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:forceHasOverlappingRendering="false"
-            android:gravity="center" />
-
-    </com.android.launcher3.taskbar.TaskbarView>
+        android:gravity="center"/>
 
     <com.android.launcher3.taskbar.ImeBarView
         android:id="@+id/ime_bar_view"