KeyChain does not use cleartext network traffic.

This declares to the platform and tools that this app does not use
cleartext network traffic. The platform and tools will be blocking
(on best effort basis) attempts to use such traffic by this app.
For example, attempts to use HTTP (rather than HTTPS) will be blocked.

Bug: 19215516
Change-Id: I4c6215af47112f75c577fa1174d85ca2165aeea3
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 4658206..3e03c87 100755
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -4,7 +4,8 @@
           android:sharedUserId="android.uid.system"
           >
     <application android:label="@string/app_name"
-            android:allowBackup="false" >
+            android:allowBackup="false"
+            android:usesCleartextTraffic="false" >
         <service android:name="com.android.keychain.KeyChainService">
             <intent-filter>
                 <action android:name="android.security.IKeyChainService"/>