[Download] Return DownloadInterruptReason from OnStartedCallback

content/public/browser/download_interrupt_reason_values.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Note that the embedder is welcome to persist these values across
 // invocations of the browser, and possibly across browser versions.
 // Thus individual errors may be deprecated and new errors added, but
 // the values of particular errors should not be changed.
 
 // File errors.
@@ skipping 52 matching lines @@
 INTERRUPT_REASON(NETWORK_TIMEOUT, 21)
 
 // The network connection has been lost.
 // "Connection Lost".
 INTERRUPT_REASON(NETWORK_DISCONNECTED, 22)
 
 // The server has gone down.
 // "Server Down".
 INTERRUPT_REASON(NETWORK_SERVER_DOWN, 23)
 
+// The network request was invalid. This may be due to the original URL or a
+// redirected URL:
+// - Having an unsupported scheme.
+// - Being an invalid URL.
+// - Being disallowed by policy.
+INTERRUPT_REASON(NETWORK_INVALID_REQUEST, 24)
 
 // Server responses.
 
 // The server indicates that the operation has failed (generic).
 // "Server Error".
 INTERRUPT_REASON(SERVER_FAILED, 30)
 
 // The server does not support range requests.
 // Internal use only:  must restart from the beginning.
 INTERRUPT_REASON(SERVER_NO_RANGE, 31)
@@ skipping 16 matching lines @@
 // The user shut down the browser.
 // Internal use only:  resume pending downloads if possible.
 INTERRUPT_REASON(USER_SHUTDOWN, 41)
 
 
 // Crash.
 
 // The browser crashed.
 // Internal use only:  resume pending downloads if possible.
 INTERRUPT_REASON(CRASH, 50)