Tell each VM to flush their DNS cache.

bug:3095357
Change-Id: I93de24e3e5a7d8b94d55f4facfffc863a2b8c202
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 3331e1b..43f175f 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -91,6 +91,7 @@
     <protected-broadcast android:name="android.nfc.action.TAG_DISCOVERED" />
     <protected-broadcast android:name="android.nfc.action.LLCP_LINK_STATE_CHANGED" />
     <protected-broadcast android:name="android.nfc.action.TRANSACTION_DETECTED" />
+    <protected-broadcast android:name="android.intent.action.CLEAR_DNS_CACHE" />
 
     <!-- ====================================== -->
     <!-- Permissions for things that cost money -->