Remove an incorrect javadoc comment.

The comment references a parameter that is not part of the
method.

Change-Id: Ia2b5c81e4d09bb7e1614a84f2532520730244cae
diff --git a/src/com/android/browser/search/OpenSearchSearchEngine.java b/src/com/android/browser/search/OpenSearchSearchEngine.java
index 3c1cd5b..a19e50d 100644
--- a/src/com/android/browser/search/OpenSearchSearchEngine.java
+++ b/src/com/android/browser/search/OpenSearchSearchEngine.java
@@ -168,7 +168,6 @@
      * Executes a GET request and returns the response content.
      *
      * @param url Request URI.
-     * @param requestHeaders Request headers.
      * @return The response content. This is the empty string if the response
      *         contained no content.
      */