[refactor] Remove unused shutdownMicrodroid in MicrodroidHostTestCaseBase

Test: atest MicrodroidHostTests
Bug: 218751146
Change-Id: I455702bd9bce5ad381f4465b8ab2e3ab7b948ed8
diff --git a/tests/hostside/helper/java/com/android/microdroid/test/host/MicrodroidHostTestCaseBase.java b/tests/hostside/helper/java/com/android/microdroid/test/host/MicrodroidHostTestCaseBase.java
index b4b3795..ac37ee0 100644
--- a/tests/hostside/helper/java/com/android/microdroid/test/host/MicrodroidHostTestCaseBase.java
+++ b/tests/hostside/helper/java/com/android/microdroid/test/host/MicrodroidHostTestCaseBase.java
@@ -42,7 +42,6 @@
 
 public abstract class MicrodroidHostTestCaseBase extends BaseHostJUnit4Test {
     protected static final String TEST_ROOT = "/data/local/tmp/virt/";
-    protected static final String VIRT_APEX = "/apex/com.android.virt/";
     protected static final String LOG_PATH = TEST_ROOT + "log.txt";
     protected static final String CONSOLE_PATH = TEST_ROOT + "console.txt";
     private static final int TEST_VM_ADB_PORT = 8000;
@@ -191,14 +190,6 @@
         return pathLine.substring("package:".length());
     }
 
-    public static void shutdownMicrodroid(ITestDevice androidDevice, String cid)
-            throws DeviceNotAvailableException {
-        CommandRunner android = new CommandRunner(androidDevice);
-
-        // Shutdown the VM
-        android.run(VIRT_APEX + "bin/vm", "stop", cid);
-    }
-
     // Establish an adb connection to microdroid by letting Android forward the connection to
     // microdroid. Wait until the connection is established and microdroid is booted.
     public static void adbConnectToMicrodroid(ITestDevice androidDevice, String cid) {
diff --git a/tests/hostside/java/com/android/microdroid/test/MicrodroidHostTests.java b/tests/hostside/java/com/android/microdroid/test/MicrodroidHostTests.java
index 4e9c501..cffaae1 100644
--- a/tests/hostside/java/com/android/microdroid/test/MicrodroidHostTests.java
+++ b/tests/hostside/java/com/android/microdroid/test/MicrodroidHostTests.java
@@ -85,6 +85,7 @@
     private static final String APK_NAME = "MicrodroidTestApp.apk";
     private static final String PACKAGE_NAME = "com.android.microdroid.test";
     private static final String SHELL_PACKAGE_NAME = "com.android.shell";
+    private static final String VIRT_APEX = "/apex/com.android.virt/";
 
     private static final int MIN_MEM_ARM64 = 145;
     private static final int MIN_MEM_X86_64 = 196;