Revert "[NS D01] Remove candidates that don't satisfy the request."

This reverts commit a19115d482.

Reason for revert: The feature was punted out of R.

Change-Id: Ia91b3b3c55f735dae64ffa3194614a6f2631a087

services/core/java/com/android/server/connectivity/NetworkRanker.java

@@ -20,7 +20,6 @@ import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.net.NetworkRequest;
 
-import java.util.ArrayList;
 import java.util.Collection;
 
 /**
@@ -32,15 +31,15 @@ public class NetworkRanker {
     /**
      * Find the best network satisfying this request among the list of passed networks.
      */
+    // Almost equivalent to Collections.max(nais), but allows returning null if no network
+    // satisfies the request.
     @Nullable
     public NetworkAgentInfo getBestNetwork(@NonNull final NetworkRequest request,
             @NonNull final Collection<NetworkAgentInfo> nais) {
-        final ArrayList<NetworkAgentInfo> candidates = new ArrayList<>(nais);
-        candidates.removeIf(nai -> !nai.satisfies(request));
-
         NetworkAgentInfo bestNetwork = null;
         int bestScore = Integer.MIN_VALUE;
-        for (final NetworkAgentInfo nai : candidates) {
+        for (final NetworkAgentInfo nai : nais) {
+            if (!nai.satisfies(request)) continue;
             if (nai.getCurrentScore() > bestScore) {
                 bestNetwork = nai;
                 bestScore = nai.getCurrentScore();