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This CL allows SimpleURLLoader's to successfully load file:// URLs, ie when
using FileURLLoaderFactory.

Prior to this CL, even on the file specified in the file:// URL is written
successfully, the URLLoaderCompletionStatus instance is passed to the
URLLoaderClient from FileURLLoader::OnFileWritten, had only with the
|error_code| set.

SimpleURLLoader checks other URLLoaderCompletionStatus class members,
(eg |decoded_body_length|) in order to consider the load actually successful.

BUG=773295,844928

Change-Id: I1040775fad2af7f0eb88f81e48bb355d48e5fc31
Reviewed-on: https://chromium-review.googlesource.com/1159042Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#580130}