libchromeos: Clean up/moved file into sub-directories

Moved related files in libchromeos into sub-directories
to make it easier to navigate code.

BUG=None
TEST=FEATURES=test emerge-link libchromeos buffet peerd
CQ-DEPEND=CL:214763

Change-Id: I50d690f19f09a8f4d0da1154e63f58c76c415a55
Reviewed-on: https://chromium-review.googlesource.com/214499
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/buffet/commands/command_dictionary.h b/buffet/commands/command_dictionary.h
index 10a4f9d..8356bcb 100644
--- a/buffet/commands/command_dictionary.h
+++ b/buffet/commands/command_dictionary.h
@@ -11,7 +11,7 @@
 #include <vector>
 
 #include <base/basictypes.h>
-#include <chromeos/error.h>
+#include <chromeos/errors/error.h>
 
 namespace base {
 class Value;