Use existing ContextCompat library for permissions checking.

Bug: 25776171
Change-Id: I4bf43d5f8c2026c0ae593cdbcf0572db0808970a
diff --git a/src/com/android/dialer/util/TelecomUtil.java b/src/com/android/dialer/util/TelecomUtil.java
index 58675cf..1230577 100644
--- a/src/com/android/dialer/util/TelecomUtil.java
+++ b/src/com/android/dialer/util/TelecomUtil.java
@@ -22,6 +22,7 @@
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.CallLog.Calls;
+import android.support.v4.content.ContextCompat;
 import android.telecom.PhoneAccountHandle;
 import android.telecom.TelecomManager;
 import android.text.TextUtils;
@@ -181,7 +182,7 @@
     }
 
     private static boolean hasPermission(Context context, String permission) {
-        return context.getPackageManager().checkPermission(permission, context.getPackageName())
+        return ContextCompat.checkSelfPermission(context, permission)
                 == PackageManager.PERMISSION_GRANTED;
     }