HOME_STACK_ID, ASSISTANT_STACK_ID, and RECENTS_STACK_ID be gone!

Replaced usages with ACTIVITY_TYPE_HOME, ACTIVITY_TYPE_ASSISTANT
and ACTIVITY_TYPE_RECENTS.

Test: go/wm-smoke
Test: Existing tests pass.
Bug: 64146578
Change-Id: I62c55c99df86dba8c9ba9d9986049de1b1083234
diff --git a/services/tests/servicestests/src/com/android/server/wm/TaskStackContainersTests.java b/services/tests/servicestests/src/com/android/server/wm/TaskStackContainersTests.java
index 29bbe6e..536a504 100644
--- a/services/tests/servicestests/src/com/android/server/wm/TaskStackContainersTests.java
+++ b/services/tests/servicestests/src/com/android/server/wm/TaskStackContainersTests.java
@@ -29,7 +29,7 @@
 import android.support.test.filters.SmallTest;
 import android.support.test.runner.AndroidJUnit4;
 
-import static android.app.ActivityManager.StackId.getWindowingModeForStackId;
+import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -53,8 +53,7 @@
     public void setUp() throws Exception {
         super.setUp();
         final Configuration overrideConfig = new Configuration();
-        overrideConfig.windowConfiguration.setWindowingMode(
-                getWindowingModeForStackId(PINNED_STACK_ID, false /* inSplitScreenMode */));
+        overrideConfig.windowConfiguration.setWindowingMode(WINDOWING_MODE_PINNED);
         mPinnedStack = new StackWindowController(PINNED_STACK_ID, null,
                 mDisplayContent.getDisplayId(), true /* onTop */, new Rect(), sWm).mContainer;
         mPinnedStack.onOverrideConfigurationChanged(overrideConfig);