Clean up removed flag. (#4125)

Author: davidmorgan

build_daemon/example/example.dart

@@ -23,7 +23,6 @@ void main(List<String> args) async {
       'run',
       'build_runner',
       'daemon',
-      '--delete-conflicting-outputs',
     ], logHandler: print);
   } catch (e) {
     if (e is VersionSkew) {

build_modules/test/build_test.dart

@@ -37,12 +37,7 @@ void main() {
     expect(_changedGeneratedFiles(), isEmpty);
 
     // 2 - run build - should be no output, since nothing should change
-    var result = _runProc('dart', [
-      'run',
-      'build_runner',
-      'build',
-      '--delete-conflicting-outputs',
-    ]);
+    var result = _runProc('dart', ['run', 'build_runner', 'build']);
     expect(result, contains(BuildLog.successPattern));
 
     // 3 - get a list of modified `.g.dart` files - should still be empty

build_runner/README.md

@@ -84,9 +84,6 @@ The available commands are `build`, `watch`, `serve`, and `test`.
 All the above commands support the following arguments:
 
 - `--help`: Print usage information for the command.
-- `--delete-conflicting-outputs`: Assume conflicting outputs in the users
-  package are from previous builds, and skip the user prompt that would usually
-  be provided.
 - `--[no-]fail-on-severe`: Whether to consider the build a failure on an error
   logged. By default this is false.
 - `--build-filter`: Build filters allow you to choose explicitly which files to

build_runner/test/generate/build_integration_test.dart

@@ -65,11 +65,7 @@ main(List<String> args) async {
         ]).create();
 
         // Run a build and validate the full rebuild output.
-        var result = await runDart(
-          'a',
-          'tool/build.dart',
-          args: ['build', '--delete-conflicting-outputs'],
-        );
+        var result = await runDart('a', 'tool/build.dart', args: ['build']);
         expect(result.exitCode, 0, reason: result.stderr as String);
         expect(
           result.stdout,
@@ -90,11 +86,7 @@ main(List<String> args) async {
           d.dir('tool', [d.file('build.dart', changedBuildScript)]),
         ]).create();
 
-        var result = await runDart(
-          'a',
-          'tool/build.dart',
-          args: ['build', '--delete-conflicting-outputs'],
-        );
+        var result = await runDart('a', 'tool/build.dart', args: ['build']);
         expect(result.exitCode, 0, reason: result.stderr as String);
         expect(
           result.stdout,

build_runner/test/generate/watch_integration_test.dart

@@ -23,7 +23,7 @@ import 'package:build_runner_core/build_runner_core.dart';
 import 'package:build_test/build_test.dart';
 
 main() async {
-  await run(['watch', '--delete-conflicting-outputs', '-o', 'output_dir'], [
+  await run(['watch', '-o', 'output_dir'], [
     applyToRoot(new TestBuilder(
         buildExtensions: appendExtension('.copy', from: '.txt')))
   ]);