Replace usage of basictypes.h with a combination of stdint.h and base/macros.h.

Fix some style issues regarding order of includes and forward declararions.

BUG=416623

Review URL: https://codereview.chromium.org/590333002

Cr-Commit-Position: refs/heads/master@{#296139}
diff --git a/components/component_updater/test/request_sender_unittest.cc b/components/component_updater/test/request_sender_unittest.cc
index 993a6f4..f93d49d 100644
--- a/components/component_updater/test/request_sender_unittest.cc
+++ b/components/component_updater/test/request_sender_unittest.cc
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"