AndroidKeyStore: fix tests

Change-Id: I65fd8ba27af57ea8fd27c8e08c9c1201f32c494d
diff --git a/keystore/tests/src/android/security/AndroidKeyStoreTest.java b/keystore/tests/src/android/security/AndroidKeyStoreTest.java
index 49e2f12..056e681 100644
--- a/keystore/tests/src/android/security/AndroidKeyStoreTest.java
+++ b/keystore/tests/src/android/security/AndroidKeyStoreTest.java
@@ -577,17 +577,14 @@
         assertAliases(new String[] { });
     }
 
-    public void testKeyStore_DeleteEntry_EmptyStore_Failure() throws Exception {
+    public void testKeyStore_DeleteEntry_EmptyStore_Success() throws Exception {
         mKeyStore.load(null, null);
 
-        try {
-            mKeyStore.deleteEntry(TEST_ALIAS_1);
-            fail("Should throw KeyStoreException with non-existent alias");
-        } catch (KeyStoreException success) {
-        }
+        // Should not throw when a non-existent entry is requested for delete.
+        mKeyStore.deleteEntry(TEST_ALIAS_1);
     }
 
-    public void testKeyStore_DeleteEntry_NonExistent_Failure() throws Exception {
+    public void testKeyStore_DeleteEntry_NonExistent_Success() throws Exception {
         mKeyStore.load(null, null);
 
         // TEST_ALIAS_1
@@ -596,11 +593,8 @@
         assertTrue(mAndroidKeyStore.put(Credentials.USER_CERTIFICATE + TEST_ALIAS_1, FAKE_USER_1));
         assertTrue(mAndroidKeyStore.put(Credentials.CA_CERTIFICATE + TEST_ALIAS_1, FAKE_CA_1));
 
-        try {
-            mKeyStore.deleteEntry(TEST_ALIAS_2);
-            fail("Should throw KeyStoreException with non-existent alias");
-        } catch (KeyStoreException success) {
-        }
+        // Should not throw when a non-existent entry is requested for delete.
+        mKeyStore.deleteEntry(TEST_ALIAS_2);
     }
 
     public void testKeyStore_GetCertificate_Single_Success() throws Exception {