Remove DynamicAvailabilityPreferenceController.

- This class is over complex to use, and get in the way of show/hide
  pref when availability change.
- The function from DynamicAvailabilityPreferenceController can be done
  with PreferenceCategoryController.

Bug: 68956750
Bug: 32953042
Test: robotests
Change-Id: Ia7b7e214c072b8c77f5de3d959fdb1dc79217f76

tests/robotests/src/com/android/settings/enterprise/CaCertsPreferenceControllerTestBase.java

@@ -17,15 +17,12 @@
 package com.android.settings.enterprise;
 
 import static com.google.common.truth.Truth.assertThat;
-
-import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import android.content.Context;
 import android.support.v7.preference.Preference;
 
 import com.android.settings.R;
-import com.android.settings.core.PreferenceAvailabilityObserver;
 import com.android.settings.testutils.FakeFeatureFactory;
 
 import org.junit.Before;
@@ -43,8 +40,6 @@ public abstract class CaCertsPreferenceControllerTestBase {
     protected Context mContext;
     protected FakeFeatureFactory mFeatureFactory;
     protected CaCertsPreferenceControllerBase mController;
-    @Mock
-    private PreferenceAvailabilityObserver mObserver;
 
     @Before
     public void setUp() {
@@ -52,12 +47,6 @@ public abstract class CaCertsPreferenceControllerTestBase {
         FakeFeatureFactory.setupForTest(mContext);
         mFeatureFactory = (FakeFeatureFactory) FakeFeatureFactory.getFactory(mContext);
         mController = createController();
-        mController.setAvailabilityObserver(mObserver);
-    }
-
-    @Test
-    public void testGetAvailabilityObserver() {
-        assertThat(mController.getAvailabilityObserver()).isEqualTo(mObserver);
     }
 
     @Test
@@ -75,11 +64,9 @@ public abstract class CaCertsPreferenceControllerTestBase {
     public void testIsAvailable() {
         mockGetNumberOfCaCerts(0);
         assertThat(mController.isAvailable()).isFalse();
-        verify(mObserver).onPreferenceAvailabilityUpdated(getPreferenceKey(), false);
 
         mockGetNumberOfCaCerts(10);
         assertThat(mController.isAvailable()).isTrue();
-        verify(mObserver).onPreferenceAvailabilityUpdated(getPreferenceKey(), true);
     }
 
     @Test