Fix PageLoadMetricsBrowserTest.ReceivedCompleteResources with network service

We need to notify download progress even if report_raw_headers is not
set.

Bug: 875298
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I1074a50ca60cdbbb00cd265d83487abe55160732
Reviewed-on: https://chromium-review.googlesource.com/1184038Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585052}

services/network/url_loader.cc

@@ -778,9 +778,9 @@ void URLLoader::DidRead(int num_bytes, bool completed_synchronously) {
   if (num_bytes > 0) {
     pending_write_buffer_offset_ += num_bytes;
 
-    // Only notify client of download progress in case DevTools are attached
-    // and we're done sniffing and started sending response.
-    if (report_raw_headers_ && !consumer_handle_.is_valid()) {
+    // Only notify client of download progress if we're done sniffing and
+    // started sending response.
+    if (!consumer_handle_.is_valid()) {
       int64_t total_encoded_bytes = url_request_->GetTotalReceivedBytes();
       int64_t delta = total_encoded_bytes - reported_total_encoded_bytes_;
       DCHECK_LE(0, delta);

testing/buildbot/filters/mojo.fyi.network_browser_tests.filter

@@ -73,7 +73,6 @@
 
 # https://crbug.com/816684 Track Page Load Metrics.
 -PageLoadMetricsBrowserTest.LoadingMetricsFailed
--PageLoadMetricsBrowserTest.ReceivedCompleteResources
 
 # https://crbug.com/810329 DnsProbe browsertests that rely on delaying requests:
 -DnsProbeBrowserTest.NxdomainProbeResultWithWorkingSlowCorrections