Replace base/task/ temporary forward headers with their final locations

Note to QA: This merely changes includes and should not be blamed
for files it touched.

Bug: 1255932
Change-Id: I1ce4e31efd5792ebf2080812e665cae838a54972
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3226943
Reviewed-by: Gabriel Charette <[email protected]>
Owners-Override: Gabriel Charette <[email protected]>
Cr-Commit-Position: refs/heads/main@{#932153}
diff --git a/base/task/task_runner.cc b/base/task/task_runner.cc
index 630a8fb..7364b899 100644
--- a/base/task/task_runner.cc
+++ b/base/task/task_runner.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/task/task_runner_forward.h"
+#include "base/task/task_runner.h"
 
 #include <utility>