Update header includes for /base/functional in /chrome/browser part 1

bind.h, callback.h, callback_forward.h, and callback_helpers.h
moved into /base/functional/. Update the include paths to
directly include them in their new location.

Bug: 1364441
Change-Id: I3d0df88f548b210f01609dff17be68dfc86d3bb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4144860
Owners-Override: Avi Drissman <[email protected]>
Owners-Override: Daniel Cheng <[email protected]>
Commit-Queue: Avi Drissman <[email protected]>
Auto-Submit: Avi Drissman <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Commit-Queue: Daniel Cheng <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1089988}
diff --git a/chrome/browser/chrome_process_singleton.h b/chrome/browser/chrome_process_singleton.h
index 3958990..ae42df1 100644
--- a/chrome/browser/chrome_process_singleton.h
+++ b/chrome/browser/chrome_process_singleton.h
@@ -5,8 +5,8 @@
 #ifndef CHROME_BROWSER_CHROME_PROCESS_SINGLETON_H_
 #define CHROME_BROWSER_CHROME_PROCESS_SINGLETON_H_
 
-#include "base/callback.h"
 #include "base/files/file_path.h"
+#include "base/functional/callback.h"
 #include "chrome/browser/process_singleton.h"
 #include "chrome/browser/process_singleton_modal_dialog_lock.h"
 #include "chrome/browser/process_singleton_startup_lock.h"