iwyu: Cleanup in the following files:
* at_exit.cc
* atomicops.h
* base_paths.h
* bzip2_error_handler.cc
* callback_internal.h
* command_line.cc
* cpu.cc
* environment.h
* event_recorder.cc
* file_descriptor_shuffle.cc
* file_path.cc

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6759017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80340 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/environment.h b/base/environment.h
index ebad820..cf71724 100644
--- a/base/environment.h
+++ b/base/environment.h
@@ -9,7 +9,7 @@
 #include <string>
 
 #include "base/base_api.h"
-#include "base/basictypes.h"
+#include "build/build_config.h"
 
 namespace base {