Switch to standard integer types in components/, part 2 of 4.

components/gcm_driver/gcm_stats_recorder_android_unittest.cc

 // Copyright 2015 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 "components/gcm_driver/gcm_stats_recorder_android.h"
 
+#include <stddef.h>
+
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gcm {
 
 namespace {
 
 const char kTestAppId[] = "test_app_id";
 
 class GCMStatsRecorderAndroidTest : public ::testing::Test,
                                     public GCMStatsRecorderAndroid::Delegate {
@@ skipping 78 matching lines @@
 
   RecordedActivities activities;
   recorder.CollectActivities(&activities);
 
   EXPECT_EQ(0u, activities.registration_activities.size());
 }
 
 }  // namespace
 
 }  // namespace gcm