Revert "Pass platform configuration to Dart VM for insecure socket policy (#20733)" (#20812)

This reverts commit d241105.

Author: renyou

shell/platform/android/io/flutter/embedding/engine/loader/FlutterLoader.java

@@ -216,9 +216,10 @@ public void ensureInitializationComplete(
       }
 
       shellArgs.add("--cache-dir-path=" + result.engineCachesPath);
-      if (!flutterApplicationInfo.clearTextPermitted) {
-        shellArgs.add("--disallow-insecure-connections");
-      }
+      // TODO(mehmetf): Announce this since it is a breaking change then enable it.
+      // if (!flutterApplicationInfo.clearTextPermitted) {
+      //   shellArgs.add("--disallow-insecure-connections");
+      // }
       if (flutterApplicationInfo.domainNetworkPolicy != null) {
         shellArgs.add("--domain-network-policy=" + flutterApplicationInfo.domainNetworkPolicy);
       }

shell/platform/darwin/ios/framework/Source/FlutterDartProject.mm

@@ -140,6 +140,12 @@
   settings.domain_network_policy =
       [FlutterDartProject domainNetworkPolicy:appTransportSecurity].UTF8String;
 
+  // TODO(mehmetf): We need to announce this change since it is breaking.
+  // Remove these two lines after we announce and we know which release this is
+  // going to be part of.
+  settings.may_insecurely_connect_to_all_domains = true;
+  settings.domain_network_policy = "";
+
 #if FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
   // There are no ownership concerns here as all mappings are owned by the
   // embedder and not the engine.