Revert "Minimal test harness for iOS (#13029)" (#18631)

This reverts commit 0622b051b63b399838eb7956bed97d76fc8bdf77.
diff --git a/build/darwin/ios_app.gni b/build/darwin/ios_app.gni
deleted file mode 100644
index 13b94e5..0000000
--- a/build/darwin/ios_app.gni
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2013 The Flutter Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-template("ios_app") {
-  assert(is_ios)
-
-  copy("${target_name}__info_plist") {
-    sources = [
-      invoker.info_plist,
-    ]
-    outputs = [
-      "$root_out_dir/${target_name}.app/Info.plist",
-    ]
-  }
-  executable("$target_name") {
-    forward_variables_from(invoker, "*")
-    output_name = "${target_name}.app/$target_name"
-
-    deps += [ ":${target_name}__info_plist" ]
-  }
-}
diff --git a/ci/licenses_golden/licenses_flutter b/ci/licenses_golden/licenses_flutter
index ba413f5..1103a89 100755
--- a/ci/licenses_golden/licenses_flutter
+++ b/ci/licenses_golden/licenses_flutter
@@ -851,8 +851,6 @@
 FILE: ../../../flutter/shell/platform/darwin/common/framework/Source/FlutterStandardCodec_Internal.h
 FILE: ../../../flutter/shell/platform/darwin/common/framework/Source/flutter_codecs_unittest.mm
 FILE: ../../../flutter/shell/platform/darwin/common/framework/Source/flutter_standard_codec_unittest.mm
-FILE: ../../../flutter/shell/platform/darwin/ios/FlutterTestsInfo.plist
-FILE: ../../../flutter/shell/platform/darwin/ios/flutter_unittests.mm
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Flutter.podspec
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Headers/Flutter.h
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Headers/FlutterAppDelegate.h
diff --git a/shell/platform/darwin/ios/BUILD.gn b/shell/platform/darwin/ios/BUILD.gn
index a71cd79..9166eba 100644
--- a/shell/platform/darwin/ios/BUILD.gn
+++ b/shell/platform/darwin/ios/BUILD.gn
@@ -5,7 +5,6 @@
 assert(is_ios)
 
 import("//build/config/ios/ios_sdk.gni")
-import("//flutter/build/darwin/ios_app.gni")
 import("//flutter/common/config.gni")
 import("//flutter/shell/gpu/gpu.gni")
 import("//flutter/shell/platform/darwin/common/framework_shared.gni")
@@ -331,29 +330,6 @@
   ]
 }
 
-test_fixtures("flutter_tests_fixtures") {
-  fixtures = []
-}
-
-# Note: This currently isn't used, it might be removed.
-ios_app("FlutterTests") {
-  testonly = true
-
-  info_plist = "FlutterTestsInfo.plist"
-
-  sources = [
-    "flutter_unittests.mm",
-  ]
-
-  libs = [ "Foundation.framework" ]
-
-  deps = [
-    ":flutter_tests_fixtures",
-    "//flutter/runtime:libdart",
-    "//flutter/testing",
-  ]
-}
-
 group("flutter_framework") {
   deps = [
     ":copy_and_verify_framework_headers",
diff --git a/shell/platform/darwin/ios/FlutterTestsInfo.plist b/shell/platform/darwin/ios/FlutterTestsInfo.plist
deleted file mode 100644
index 8af0cac..0000000
--- a/shell/platform/darwin/ios/FlutterTestsInfo.plist
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-  <key>CFBundleDevelopmentRegion</key>
-  <string>en</string>
-  <key>CFBundleExecutable</key>
-  <string>FlutterTests</string>
-  <key>CFBundleIdentifier</key>
-  <string>io.flutter.FlutterTests</string>
-  <key>CFBundleInfoDictionaryVersion</key>
-  <string>6.0</string>
-  <key>CFBundleName</key>
-  <string>FlutterTests</string>
-  <key>CFBundleVersion</key>
-  <string>1.0</string>
-  <key>CFBundleShortVersionString</key>
-  <string>1.0</string>
-</dict>
-</plist>
diff --git a/shell/platform/darwin/ios/flutter_unittests.mm b/shell/platform/darwin/ios/flutter_unittests.mm
deleted file mode 100644
index 35dce37..0000000
--- a/shell/platform/darwin/ios/flutter_unittests.mm
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2013 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#import <Foundation/Foundation.h>
-
-#include "flutter/testing/testing.h"
-
-namespace flutter_tests {
-
-TEST(SmokeTest, Success) {
-  EXPECT_EQ(1, 1);
-}
-
-TEST(SmokeTest, Fail) {
-  EXPECT_EQ(1, 2);
-}
-
-}