Fix includes on FileWriter.

BUG=None
TEST=Code builds.

Change-Id: I796abca91a79a65a2ad37224199cb54079000f13
Reviewed-on: https://chromium-review.googlesource.com/200288
Tested-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: David Zeuthen <zeuthen@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
diff --git a/file_writer.h b/file_writer.h
index 69d6ff9..9350bb6 100644
--- a/file_writer.h
+++ b/file_writer.h
@@ -9,8 +9,10 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
-#include "base/logging.h"
-#include "update_engine/action_processor.h"
+
+#include <base/logging.h>
+
+#include "update_engine/error_code.h"
 #include "update_engine/utils.h"
 
 // FileWriter is a class that is used to (synchronously, for now) write to