Enforce minimum plugin version iOS 11 (#103545)

dev/devicelab/lib/tasks/plugin_tests.dart

@@ -204,7 +204,7 @@ class $dartPluginClass {
     podspecContent = podspecContent.replaceFirst(
       versionString,
       target == 'ios'
-          ? "s.platform = :ios, '7.0'"
+          ? "s.platform = :ios, '10.0'"
           : "s.platform = :osx, '10.8'"
     );
     podspec.writeAsStringSync(podspecContent, flush: true);
@@ -240,8 +240,8 @@ class $dartPluginClass {
           if (target == 'ios') {
             // Plugins with versions lower than the app version should not have IPHONEOS_DEPLOYMENT_TARGET set.
             // The plugintest plugin target should not have IPHONEOS_DEPLOYMENT_TARGET set since it has been lowered
-            // in _reduceDarwinPluginMinimumVersion to 7, which is below the target version of 9.
-            if (podsProjectContent.contains('IPHONEOS_DEPLOYMENT_TARGET = 7')) {
+            // in _reduceDarwinPluginMinimumVersion to 10, which is below the target version of 11.
+            if (podsProjectContent.contains('IPHONEOS_DEPLOYMENT_TARGET = 10')) {
               throw TaskResult.failure('Plugin build setting IPHONEOS_DEPLOYMENT_TARGET not removed');
             }
             if (!podsProjectContent.contains(r'"EXCLUDED_ARCHS[sdk=iphonesimulator*]" = "$(inherited) i386";')) {

packages/flutter_tools/bin/podhelper.rb

@@ -34,7 +34,7 @@ def flutter_additional_ios_build_settings(target)
   return unless target.platform_name == :ios
 
   # [target.deployment_target] is a [String] formatted as "8.0".
-  inherit_deployment_target = target.deployment_target[/\d+/].to_i < 9
+  inherit_deployment_target = target.deployment_target[/\d+/].to_i < 11
 
   # This podhelper script is at $FLUTTER_ROOT/packages/flutter_tools/bin.
   # Add search paths from $FLUTTER_ROOT/bin/cache/artifacts/engine.