Revert "Don't try to resolve CocoaPods unless project has plugins" (#9719)

* Revert "Document ScrollController (#9705)"

This reverts commit ff8609f2.

* Revert "Fix channels integration test (#9713)"

This reverts commit aace622d.

* Revert "Fix flutter view project's automated tests (#9712)"

This reverts commit 1a4bf9b6.

* Revert "Update hello_world_memory_test package name (#9704)"

This reverts commit ffa8483f.

* Revert "Increment the flutter package version (#9699)"

This reverts commit 3b237a8c.

* Revert "Don’t pod unless there are plugins (#9701)"

This reverts commit 732f79ee.

packages/flutter_tools/lib/src/ios/mac.dart

@@ -152,9 +152,8 @@ Future<XcodeBuildResult> buildXcodeProject({
   // copied over to a location that is suitable for Xcodebuild to find them.
   final Directory appDirectory = fs.directory(app.appDirectory);
   await _addServicesToBundle(appDirectory);
-  final bool hasFlutterPlugins = injectPlugins();
+  injectPlugins();
 
-  if (hasFlutterPlugins)
   await _runPodInstall(appDirectory, flutterFrameworkDir(mode));
 
   final List<String> commands = <String>[

packages/flutter_tools/lib/src/plugins.dart

@@ -194,11 +194,7 @@ void _writeIOSPluginRegistry(String directory, List<Plugin> plugins) {
 
 }
 
-/// Finds Flutter plugins in the pubspec.yaml, creates platform injection
-/// registries classes and add them to the build depedencies.
-///
-/// Returns whether any Flutter plugins are added.
-bool injectPlugins({String directory}) {
+void injectPlugins({String directory}) {
   directory ??= fs.currentDirectory.path;
   final List<Plugin> plugins = _findPlugins(directory);
   _writeFlutterPluginsList(directory, plugins);
@@ -206,5 +202,4 @@ bool injectPlugins({String directory}) {
     _writeAndroidPluginRegistry(directory, plugins);
   if (fs.isDirectorySync(fs.path.join(directory, 'ios')))
     _writeIOSPluginRegistry(directory, plugins);
-  return plugins.isNotEmpty;
 }