Replace 'the the' with 'the'

tests/compiler/dart2js_native/native_missing_method1_frog_test.dart

Index: tests/compiler/dart2js_native/native_missing_method1_frog_test.dart
diff --git a/tests/compiler/dart2js_native/native_missing_method1_frog_test.dart b/tests/compiler/dart2js_native/native_missing_method1_frog_test.dart
index 08aa4808d26782c4c9133ea42a038780e3983779..8120fd97784448ba877ae5ab9db1ca3f756bd132 100644
--- a/tests/compiler/dart2js_native/native_missing_method1_frog_test.dart
+++ b/tests/compiler/dart2js_native/native_missing_method1_frog_test.dart
@@ -17,7 +17,7 @@ self.nativeConstructor(A);
 """;
 
 class B {
-  // We need to define a foo method so that dart2js sees it. Because the the
+  // We need to define a foo method so that dart2js sees it. Because the
   // only occurences of 'foo' is on B, a Dart class, no interceptor is used.  It
   // thinks all calls will either go to this method, or throw a
   // NoSuchMethodError. It is possible that the native class will shadow a