Revert of DumpWithoutCrashing() if URLRequestHttpJob is killed while waiting...

Revert of DumpWithoutCrashing() if URLRequestHttpJob is killed while waiting for callback (patchset #1 id:1 of https://codereview.chromium.org/892413007/)

Reason for revert:
Remove DumpWithoutCrashing() from URLRequestHttpJob again.

See crbug.com/432398 for stacktraces uncovered by this.

Original issue's description:
> DumpWithoutCrashing() if URLRequestHttpJob is killed while waiting for callback
>
> BUG=432398
>
> Committed: https://crrev.com/cb3d31dcc6d70edcf3f53e028fe9ec650f228c64
> Cr-Commit-Position: refs/heads/master@{#315052}

TBR=mmenke@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=432398

Review URL: https://codereview.chromium.org/906223002

Cr-Commit-Position: refs/heads/master@{#315277}

net/url_request/url_request_http_job.cc

@@ -10,7 +10,6 @@
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/alias.h"
-#include "base/debug/dump_without_crashing.h"
 #include "base/file_version_info.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/field_trial.h"
@@ -290,12 +289,6 @@ void URLRequestHttpJob::Start() {
 }
 
 void URLRequestHttpJob::Kill() {
-  if (awaiting_callback_) {
-    // TODO(battre) crbug.com/289715
-    // Simulate a crash to see who kills the job while it is waiting for a
-    // callback. This should not happen, see URLRequest::OrphanJob().
-    base::debug::DumpWithoutCrashing();
-  }
   if (!transaction_.get())
     return;