Revert "Dart2js testing: Add prefix files when running dart2js output on d8 or jsshell."

tools/testing/dart/compiler_configuration.dart

Index: tools/testing/dart/compiler_configuration.dart
diff --git a/tools/testing/dart/compiler_configuration.dart b/tools/testing/dart/compiler_configuration.dart
index 891a33bcf4b8e22fb38755613b631fa55ac126cf..abe30edf891a2f69a6b255c832b1807be4fff949 100644
--- a/tools/testing/dart/compiler_configuration.dart
+++ b/tools/testing/dart/compiler_configuration.dart
@@ -16,8 +16,7 @@ import 'test_runner.dart' show
     CompilationCommand;
 
 import 'test_suite.dart' show
-    TestInformation,
-    TestUtils;
+    TestInformation;
 
 /// Grouping of a command with its expected result.
 class CommandArtifact {
@@ -125,7 +124,6 @@ abstract class CompilerConfiguration {
 
   List<String> computeRuntimeArguments(
       RuntimeConfiguration runtimeConfiguration,
-      String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,
@@ -150,7 +148,6 @@ class NoneCompilerConfiguration extends CompilerConfiguration {
 
   List<String> computeRuntimeArguments(
       RuntimeConfiguration runtimeConfiguration,
-      String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,
@@ -179,7 +176,7 @@ class Dart2xCompilerConfiguration extends CompilerConfiguration {
           isHostChecked: isHostChecked, useSdk: useSdk);
 
   String computeCompilerPath(String buildDir) {
-    var prefix = 'sdk/bin';
+    var prefix = 'sdk/bin/';
     String suffix = executableScriptSuffix;
     if (isHostChecked) {
       // The script dart2js_developer is not included in the
@@ -265,23 +262,6 @@ class Dart2jsCompilerConfiguration extends Dart2xCompilerConfiguration {
         isCsp ? cspOutput : normalOutput,
         'application/javascript');
   }
-
-  List<String> computeRuntimeArguments(
-      RuntimeConfiguration runtimeConfiguration,
-      String buildDir,
-      TestInformation info,
-      List<String> vmOptions,
-      List<String> sharedOptions,
-      List<String> originalArguments,
-      CommandArtifact artifact) {
-    Uri sdk = useSdk ?
-        nativeDirectoryToUri(buildDir).resolve('dart-sdk/') :
-        nativeDirectoryToUri(TestUtils.dartDir().toNativePath())
-                                                .resolve('sdk/');
-    Uri preambleDir = sdk.resolve('lib/_internal/lib/preambles/');
-    return runtimeConfiguration.dart2jsPreambles(preambleDir)
-        ..add(artifact.filename);
-  }
 }
 
 /// Configuration for dart2dart compiler.
@@ -318,7 +298,6 @@ class Dart2dartCompilerConfiguration extends Dart2xCompilerConfiguration {
 
   List<String> computeRuntimeArguments(
       RuntimeConfiguration runtimeConfiguration,
-      String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,
@@ -373,7 +352,6 @@ class AnalyzerCompilerConfiguration extends CompilerConfiguration {
 
   List<String> computeRuntimeArguments(
       RuntimeConfiguration runtimeConfiguration,
-      String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,