[TaskScheduler] Remove temporary forwarding headers and mass migrate users

When this CL is approved I will rebase it on top of tree and mass
migrate all callers in a new patch set (TBR'ed change).

[email protected] (for mass migration of existing callers)

Bug: 867421
Change-Id: I41092bbc4824964ee047e0bf53e972c8f6e896a4
Reviewed-on: https://chromium-review.googlesource.com/1161116
Commit-Queue: Gabriel Charette <[email protected]>
Reviewed-by: Gabriel Charette <[email protected]>
Reviewed-by: Sami Kyöstilä <[email protected]>
Cr-Commit-Position: refs/heads/master@{#580845}
diff --git a/extensions/browser/extension_file_task_runner.cc b/extensions/browser/extension_file_task_runner.cc
index f4755722..8db38f3 100644
--- a/extensions/browser/extension_file_task_runner.cc
+++ b/extensions/browser/extension_file_task_runner.cc
@@ -5,8 +5,8 @@
 #include "extensions/browser/extension_file_task_runner.h"
 
 #include "base/sequenced_task_runner.h"
-#include "base/task/lazy_task_runner_forward.h"
-#include "base/task/task_traits_forward.h"
+#include "base/task/lazy_task_runner.h"
+#include "base/task/task_traits.h"
 
 namespace extensions {