Send less data in the DataSender test that timed out under valgrind.

extensions/renderer/api/serial/data_sender_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <queue>
 
 #include "device/serial/data_sink_receiver.h"
 #include "device/serial/data_stream.mojom.h"
 #include "extensions/renderer/api_test_base.h"
 #include "grit/extensions_renderer_resources.h"
@@ skipping 79 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(DataSenderTest);
 };
 
 TEST_F(DataSenderTest, Send) {
   expected_data_.push("aa");
   RunTest("data_sender_unittest.js", "testSend");
 }
 
 TEST_F(DataSenderTest, LargeSend) {
-  std::string pattern = "1234567890";
+  std::string pattern = "123";
   std::string expected_data;
-  for (int i = 0; i < 110; i++)
+  for (int i = 0; i < 11; i++)
     expected_data += pattern;
   expected_data_.push(expected_data);
   RunTest("data_sender_unittest.js", "testLargeSend");
 }
 
 TEST_F(DataSenderTest, SendError) {
   expected_data_.push("");
   expected_data_.push("a");
   error_to_report_.push(1);
   RunTest("data_sender_unittest.js", "testSendError");
@@ skipping 40 matching lines @@
 
 TEST_F(DataSenderTest, Cancel) {
   RunTest("data_sender_unittest.js", "testCancel");
 }
 
 TEST_F(DataSenderTest, Close) {
   RunTest("data_sender_unittest.js", "testClose");
 }
 
 }  // namespace extensions