Move bind_helpers.h contents to callback_helpers.h

Followups will change includes and remove the header.

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Change-Id: Idd1de7bd21102b389676eda7cabdadf866b94903
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521248
Auto-Submit: danakj <[email protected]>
Reviewed-by: Dale Curtis <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Commit-Queue: Dale Curtis <[email protected]>
Commit-Queue: danakj <[email protected]>
Cr-Commit-Position: refs/heads/master@{#825160}
diff --git a/net/url_request/url_request_http_job.cc b/net/url_request/url_request_http_job.cc
index b934160..6d6ea7bf 100644
--- a/net/url_request/url_request_http_job.cc
+++ b/net/url_request/url_request_http_job.cc
@@ -16,6 +16,7 @@
 #include "base/file_version_info.h"
 #include "base/location.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_functions.h"
 #include "base/metrics/histogram_macros.h"