Removes dependency on v8 from dartc testing

compiler/java/com/google/dart/runner/JavaScriptLauncher.java

Index: compiler/java/com/google/dart/runner/JavaScriptLauncher.java
diff --git a/compiler/java/com/google/dart/runner/JavaScriptLauncher.java b/compiler/java/com/google/dart/runner/JavaScriptLauncher.java
deleted file mode 100644
index 908a7b6bdb9c64fea926c690ff077a3b40633e5a..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/runner/JavaScriptLauncher.java
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-package com.google.dart.runner;
-
-import java.io.PrintStream;
-
-interface JavaScriptLauncher {
-
-  void execute(String jsScript, String sourceName, String[] args, RunnerOptions flags,
-               PrintStream stdout, PrintStream stderr)
-      throws RunnerError;
-
-}