fix all instances of "the the"

sdk/lib/io/http.dart

Index: sdk/lib/io/http.dart
diff --git a/sdk/lib/io/http.dart b/sdk/lib/io/http.dart
index c63d28bbce211b81f032f3128ae0a97a05ba9a6e..07257eaf8b2710fbcbbebc623b5f15cf15077c90 100644
--- a/sdk/lib/io/http.dart
+++ b/sdk/lib/io/http.dart
@@ -1660,7 +1660,7 @@ abstract class HttpClient {
    *
    * If a bad certificate is received on a connection attempt, the library calls
    * the function that was the value of badCertificateCallback at the time
-   * the the request is made, even if the value of badCertificateCallback
+   * the request is made, even if the value of badCertificateCallback
    * has changed since then.
    */
   set badCertificateCallback(bool callback(X509Certificate cert,