Remove sendNetworkConditionsBroadcast

sendNetworkConditionsBroadcast is removed, so
TestNetworkStackService.kt cannot override it anymore,
otherwise there will be a build break when running this
test.
Also add a comment for NETWORK_CONDITIONS_MEASURED in
AndroidManifest.xml.

Bug: 175213041
Test: atest FrameworksNetIntegrationTests
Change-Id: I7b43940dc32826c70fa82f471b35bc5cb8394aad
Merged-In: I7b43940dc32826c70fa82f471b35bc5cb8394aad

tests/net/integration/src/com/android/server/net/integrationtests/TestNetworkStackService.kt

@@ -59,7 +59,6 @@ class TestNetworkStackService : Service() {
     private class NetworkMonitorDeps(private val privateDnsBypassNetwork: Network) :
             NetworkMonitor.Dependencies() {
         override fun getPrivateDnsBypassNetwork(network: Network?) = privateDnsBypassNetwork
-        override fun sendNetworkConditionsBroadcast(context: Context, broadcast: Intent) = Unit
     }
 
     private inner class TestNetworkStackConnector(context: Context) : NetworkStackConnector(
@@ -94,4 +93,4 @@ class TestNetworkStackService : Service() {
             cb.onNetworkMonitorCreated(NetworkMonitorConnector(nm, TestPermissionChecker()))
         }
     }
-}
+}