Fix references to Devices and remove unused properties

packages/flutter_tools/lib/src/android/android_emulator.dart

@@ -17,7 +17,7 @@ class AndroidEmulators extends EmulatorDiscovery {
   bool get supportsPlatform => true;
 
   @override
-  bool get canListAnything => androidWorkflow.canListDevices;
+  bool get canListAnything => androidWorkflow.canListEmulators;
 
   @override
   Future<List<Emulator>> get emulators async => getEmulatorAvds();
@@ -44,9 +44,9 @@ List<AndroidEmulator> getEmulatorAvds() {
   if (emulatorPath == null)
     return <AndroidEmulator>[];
   final String text = runSync(<String>[emulatorPath, '-list-avds']);
-  final List<AndroidEmulator> devices = <AndroidEmulator>[];
-  parseEmulatorAvdOutput(text, devices);
-  return devices;
+  final List<AndroidEmulator> emulators = <AndroidEmulator>[];
+  parseEmulatorAvdOutput(text, emulators);
+  return emulators;
 }
 
 /// Parse the given `emulator -list-avds` output in [text], and fill out the given list

packages/flutter_tools/lib/src/android/android_workflow.dart

@@ -45,9 +45,6 @@ class AndroidWorkflow extends DoctorValidator implements Workflow {
   @override
   bool get canListEmulators => getEmulatorPath(androidSdk) != null;
 
-  @override
-  bool get canLaunchEmulators => androidSdk != null && androidSdk.validateSdkWellFormed().isEmpty;
-
   static const String _kJdkDownload = 'https://www.oracle.com/technetwork/java/javase/downloads/';
 
   /// Returns false if we cannot determine the Java version or if the version

packages/flutter_tools/lib/src/doctor.dart

@@ -212,9 +212,6 @@ abstract class Workflow {
 
   /// Are we functional enough to list emulators?
   bool get canListEmulators;
-
-  /// Could this thing launch *something*? It may still have minor issues.
-  bool get canLaunchEmulators;
 }
 
 enum ValidationType {

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

@@ -33,9 +33,6 @@ class IOSWorkflow extends DoctorValidator implements Workflow {
   @override
   bool get canListEmulators => false;
 
-  @override
-  bool get canLaunchEmulators => false;
-
   Future<bool> get hasIDeviceInstaller => exitsHappyAsync(<String>['ideviceinstaller', '-h']);
 
   Future<bool> get hasIosDeploy => exitsHappyAsync(<String>['ios-deploy', '--version']);