Update mainDexClasses.rules

To benefit from
- "Adapt mainDexClasses.rules to proguard 4.10"
  60548f3a78778bfb65f30ec2845e3b5d9ee0990a
- "Fix mainDexClasses with obfuscation."
  4f6a857f32dfb9bf17103a2bf94ee0f74cd951ce

Change-Id: If12c31c5edb7d8e7280aa8073fa9bb91b1d91282
diff --git a/tools/mainDexClasses.rules b/tools/mainDexClasses.rules
index 4a3bb50..f57cbdd 100644
--- a/tools/mainDexClasses.rules
+++ b/tools/mainDexClasses.rules
@@ -1,17 +1,22 @@
   -keep public class * extends android.app.Instrumentation {

+    <init>();

   }

   -keep public class * extends android.app.Application {

+    <init>();

+    void attachBaseContext(android.content.Context);

   }

   -keep public class * extends android.app.Activity {

+    <init>();

   }

   -keep public class * extends android.app.Service {

+    <init>();

   }

   -keep public class * extends android.content.ContentProvider {

+   <init>();

   }

   -keep public class * extends android.content.BroadcastReceiver {

+   <init>();

   }

   -keep public class * extends android.app.backup.BackupAgent {

+   <init>();

   }

-  -keep class android.support.multidex.** {

-    *;

-  }
\ No newline at end of file