Add capability to simple http server to bound Set-Cookie to URLs.

ios/web/public/test/http_server_util.h

Index: ios/web/public/test/http_server_util.h
diff --git a/ios/web/public/test/http_server_util.h b/ios/web/public/test/http_server_util.h
index 28b4879b31639162d7da773be5998ca796a69c78..b66356983795e34f89f4f85d475ff2df8bbf43f1 100644
--- a/ios/web/public/test/http_server_util.h
+++ b/ios/web/public/test/http_server_util.h
@@ -20,11 +20,12 @@ namespace test {
 void SetUpSimpleHttpServer(const std::map<GURL, std::string>& responses);
 
 // Sets up a web::test::HttpServer with a simple HtmlResponseProvider. The
-// HtmlResponseProvider will use the |responses| map to resolve URLs and include
-// Set-Cookie:|cookie| in the header.
-void SetUpSimpleHttpServerWithSetCookie(
-    const std::map<GURL, std::string>& responses,
-    const std::string& cookie);
+// HtmlResponseProvider will use the |responses| map to resolve URLs. The value
+// of |responses| is the cookie and response body pair where the first string is
+// the cookie and the second string is the response body. Set the cookie string
+// as empty string if cookie is not needed in the response headers.
+void SetUpSimpleHttpServerWithSetCookies(
+    const std::map<GURL, std::pair<std::string, std::string>>& responses);
 
 // Sets up a web::test::HttpServer with a FileBasedResponseProvider. The
 // server will try to resolve URLs as file paths relative to the application