Don't use Log.isLoggable to determine DEBUG flag

This allows unnecessary debug statements to be stripped out by
the compiler.

Change-Id: Id1b6f8bd6c86cf5014e4b76524aa3839eb31bbb8
diff --git a/src/com/android/dialer/DialtactsActivity.java b/src/com/android/dialer/DialtactsActivity.java
index 214f320..f22c3f5 100644
--- a/src/com/android/dialer/DialtactsActivity.java
+++ b/src/com/android/dialer/DialtactsActivity.java
@@ -110,7 +110,7 @@
         ActionBarController.ActivityUi {
     private static final String TAG = "DialtactsActivity";
 
-    public static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
+    public static final boolean DEBUG = false;
 
     public static final String SHARED_PREFS_NAME = "com.android.dialer_preferences";