Depend on support lib preferences

Bug: 24576551
Change-Id: Ic6190bacd3f7582c9bbc8de972da4612bd92421e
diff --git a/src/com/android/settings/MasterClear.java b/src/com/android/settings/MasterClear.java
index cf55913..8474b45 100644
--- a/src/com/android/settings/MasterClear.java
+++ b/src/com/android/settings/MasterClear.java
@@ -20,7 +20,6 @@
 import android.accounts.AccountManager;
 import android.accounts.AuthenticatorDescription;
 import android.app.Activity;
-import android.app.Fragment;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -29,7 +28,6 @@
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.os.Environment;
-import android.os.Process;
 import android.os.SystemProperties;
 import android.os.UserHandle;
 import android.os.UserManager;
@@ -41,6 +39,7 @@
 import android.widget.CheckBox;
 import android.widget.LinearLayout;
 import android.widget.TextView;
+
 import com.android.internal.logging.MetricsLogger;
 
 import java.util.List;