fix all instances of "the the"

tests/try/web/test_case.dart

Index: tests/try/web/test_case.dart
diff --git a/tests/try/web/test_case.dart b/tests/try/web/test_case.dart
index 5cb384673af60bfacea9d27a553ebffa74a6c62e..56e1157492815f3ce56bd5bdef896d574509731f 100644
--- a/tests/try/web/test_case.dart
+++ b/tests/try/web/test_case.dart
@@ -33,7 +33,7 @@ class TestCase {
  *   3. Repeat step 2 until there are no more tests.
  *
  * The purpose of this test is to simulate edits (during setup), and then let
- * the the mutation observer to process the mutations followed by validation.
+ * the mutation observer to process the mutations followed by validation.
  */
 void runTests(List<TestCase> tests) {
   Completer completer = new Completer();