Name specific app for rapid data usage.

When a single app is responsible for more than half of the data usage
that caused us to trigger a "rapid usage" alert, name that app in the
notification.  Tests to verify.

Move NPMS->NSS direct calls to "Internal" pattern, following
best-practices to avoid unnecessary AIDL exposure.

Remove 3G/4G split mobile plan support, which has been deprecated for
years and was never supported in a shipping product.

Move MultipathPolicyTracker in tree to reflect its package name.

Test: bit FrameworksNetTests:*
Test: bit FrameworksServicesTests:com.android.server.NetworkPolicyManagerServiceTest
Bug: 69263587, 64221505, 73431080, 72746951
Exempt-From-Owner-Approval: approved in previous PS
Change-Id: I3e4ec1ae2222d51b232f76f32faca93d4f8cd272

tests/net/java/com/android/server/ConnectivityServiceTest.java

@@ -914,8 +914,10 @@ public class ConnectivityServiceTest {
                 mock(INetworkPolicyManager.class),
                 mock(IpConnectivityLog.class));
 
-        mService.systemReady();
+        // Create local CM before sending system ready so that we can answer
+        // getSystemService() correctly.
         mCm = new WrappedConnectivityManager(InstrumentationRegistry.getContext(), mService);
+        mService.systemReady();
         mCm.bindProcessToNetwork(null);
 
         // Ensure that the default setting for Captive Portals is used for most tests
@@ -3412,8 +3414,10 @@ public class ConnectivityServiceTest {
 
     @Test
     public void testNetworkCallbackMaximum() {
-        final int MAX_REQUESTS = 100;
-        final int CALLBACKS = 90;
+        // We can only have 99 callbacks, because MultipathPolicyTracker is
+        // already one of them.
+        final int MAX_REQUESTS = 99;
+        final int CALLBACKS = 89;
         final int INTENTS = 10;
         assertEquals(MAX_REQUESTS, CALLBACKS + INTENTS);
 

tests/net/java/com/android/server/net/NetworkStatsServiceTest.java

@@ -95,6 +95,7 @@ import android.telephony.TelephonyManager;
 
 import com.android.internal.net.VpnInfo;
 import com.android.internal.util.test.BroadcastInterceptingContext;
+import com.android.server.LocalServices;
 import com.android.server.net.NetworkStatsService.NetworkStatsSettings;
 import com.android.server.net.NetworkStatsService.NetworkStatsSettings.Config;
 
@@ -221,6 +222,9 @@ public class NetworkStatsServiceTest {
 
     @After
     public void tearDown() throws Exception {
+        // Registered by NetworkStatsService's constructor.
+        LocalServices.removeServiceForTest(NetworkStatsManagerInternal.class);
+
         IoUtils.deleteContents(mStatsDir);
 
         mServiceContext = null;