Revert "Add UI updates for incremental app installs."

This reverts commit 84269d349d.

Reason for revert: causes b/176884453 and b/176992421

Change-Id: I3398674a0acbad8329df5d341ae074ac073a6bf9

robolectric_tests/src/com/android/launcher3/model/PackageInstallStateChangedTaskTest.java

@@ -67,7 +67,7 @@ public class PackageInstallStateChangedTaskTest {
         for (ItemInfo info : mModelHelper.getBgDataModel().itemsIdMap) {
             if (info instanceof WorkspaceItemInfo) {
                 assertEquals(updates.contains(info.id) ? progress: 0,
-                        ((WorkspaceItemInfo) info).getProgressLevel());
+                        ((WorkspaceItemInfo) info).getInstallProgress());
             } else {
                 assertEquals(updates.contains(info.id) ? progress: -1,
                         ((LauncherAppWidgetInfo) info).installProgress);