Messaging: Remove compatibility for old android versions

Change-Id: Id9065d60525a509271a0e64c0e349e857cb998e2

src/com/android/messaging/ui/contact/ContactPickerFragment.java

@@ -60,7 +60,6 @@ import com.android.messaging.util.Assert.RunsOnMainThread;
 import com.android.messaging.util.ContactUtil;
 import com.android.messaging.util.ImeUtil;
 import com.android.messaging.util.LogUtil;
-import com.android.messaging.util.OsUtil;
 import com.android.messaging.util.PhoneUtils;
 import com.android.messaging.util.UiUtils;
 import com.google.common.annotations.VisibleForTesting;
@@ -503,10 +502,6 @@ public class ContactPickerFragment extends Fragment implements ContactPickerData
      * @param show whether the contact lists are to be shown or hidden.
      */
     private void startExplodeTransitionForContactLists(final boolean show) {
-        if (!OsUtil.isAtLeastL()) {
-            // Explode animation is not supported pre-L.
-            return;
-        }
         final Explode transition = new Explode();
         final Rect epicenter = mPendingExplodeView == null ? null :
             UiUtils.getMeasuredBoundsOnScreen(mPendingExplodeView);
@@ -533,10 +528,6 @@ public class ContactPickerFragment extends Fragment implements ContactPickerData
      * the transition manager for pending explode transition.
      */
     private void toggleContactListItemsVisibilityForPendingTransition(final boolean show) {
-        if (!OsUtil.isAtLeastL()) {
-            // Explode animation is not supported pre-L.
-            return;
-        }
         mAllContactsListViewHolder.toggleVisibilityForPendingTransition(show, mPendingExplodeView);
         mFrequentContactsListViewHolder.toggleVisibilityForPendingTransition(show,
                 mPendingExplodeView);