I might as well take this to do the initial investigation and consolidate this with what's already being tracked.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/286e71bea972c6cf4fb94b02f8fd3caec69be093

commit 286e71bea972c6cf4fb94b02f8fd3caec69be093
Author: Helen Li <xunjieli@chromium.org>
Date: Fri Apr 27 01:23:44 2018

Use NET_EXPORT_PRIVATE for URLRequestThrottleManager

The only consumer of this interface is cloud print, and they don't directly
access this class. This CL hides this class, so we don't need to worry about
it when adding interfaces for Network Service.

Bug:  837333 
Change-Id: I6566030b488f39b3595a582faf7f2d52c95c7359
Reviewed-on: https://chromium-review.googlesource.com/1030930
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554253}
[modify] https://crrev.com/286e71bea972c6cf4fb94b02f8fd3caec69be093/net/url_request/url_request_throttler_manager.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/63ce1d9cfb6b6768a0cf4bfdd55341ee760089e5

commit 63ce1d9cfb6b6768a0cf4bfdd55341ee760089e5
Author: Helen Li <xunjieli@chromium.org>
Date: Wed May 02 14:04:11 2018

Move loading_test_util.cc off the deprecated URLRequestContext::CreateRequest()

CreateRequest() needs to take in a traffic annotation.

Bug:  837333 
Change-Id: Iaa4b8e0cbff89a4ffff4afef9c9cc6accdaba26f
Reviewed-on: https://chromium-review.googlesource.com/1039124
Reviewed-by: Alexandr Ilin <alexilin@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555377}
[modify] https://crrev.com/63ce1d9cfb6b6768a0cf4bfdd55341ee760089e5/chrome/browser/predictors/loading_test_util.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ac6c113cdd32774b90715a1232aca57895df04e5

commit ac6c113cdd32774b90715a1232aca57895df04e5
Author: Helen Li <xunjieli@chromium.org>
Date: Thu May 03 13:27:40 2018

Remove unused member from CacheCounter

Bug:  837333 
Change-Id: Idf0f6723d4bc0c771bd6a415bff2269fdef40e06
Reviewed-on: https://chromium-review.googlesource.com/1040206
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555703}
[modify] https://crrev.com/ac6c113cdd32774b90715a1232aca57895df04e5/chrome/browser/browsing_data/counters/cache_counter.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8897b025be9f2a27051b1bcf0dca3b7e3a240252

commit 8897b025be9f2a27051b1bcf0dca3b7e3a240252
Author: Helen Li <xunjieli@chromium.org>
Date: Thu May 03 13:29:03 2018

Remove unused URLRequestContextGetter from NaclHostMessageFilter

The field is unused.

Bug:  837333 
Change-Id: I1179efd6af649d52d43f041fc7409125a7df7b1d
Reviewed-on: https://chromium-review.googlesource.com/1040207
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555704}
[modify] https://crrev.com/8897b025be9f2a27051b1bcf0dca3b7e3a240252/chrome/browser/chrome_content_browser_client.cc
[modify] https://crrev.com/8897b025be9f2a27051b1bcf0dca3b7e3a240252/components/nacl/browser/nacl_host_message_filter.cc
[modify] https://crrev.com/8897b025be9f2a27051b1bcf0dca3b7e3a240252/components/nacl/browser/nacl_host_message_filter.h
[modify] https://crrev.com/8897b025be9f2a27051b1bcf0dca3b7e3a240252/extensions/shell/browser/shell_content_browser_client.cc

// This will be handled as part of the effort to servicify DNS-related interfaces. E.g. Issue 821021
  HostResolver* host_resolver_;

// sleevi@ is looking to this as a part of the effort to unify cert verifier and policy options related to the ssl stack.
  CertVerifier* cert_verifier_;
  TransportSecurityState* transport_security_state_;
  CTVerifier* cert_transparency_verifier_;
  CTPolicyEnforcer* ct_policy_enforcer_;

// Tracked in  Issue 840412 
  ChannelIDService* channel_id_service_;

// Tracked in  Issue 837354 
  HttpAuthHandlerFactory* http_auth_handler_factory_;

// I think this is mostly done or being worked on. Need to confirm what else is needed for services/proxy_resolver/.
  ProxyResolutionService* proxy_resolution_service_;

// mmenke@ is on this in  Issue 755309 
  scoped_refptr<SSLConfigService> ssl_config_service_;

// Partially tracked in  Issue 840359 . morlovich@ did a first pass on ChromeNetworkDelegate.  
  NetworkDelegate* network_delegate_;

// Doesn't seem to be used outside of //net
  HttpServerProperties* http_server_properties_;

// Configuration settings. There are a few consumers. Supporting these should be fairly straightforward.
  const HttpUserAgentSettings* http_user_agent_settings_;

// Seems to be only used as an intermediate class for accessing other members and for configuration
  HttpTransactionFactory* http_transaction_factory_;

// Replaced by URLLoader path.
  const URLRequestJobFactory* job_factory_;

// Not exposed outside of //net
  URLRequestThrottlerManager* throttler_manager_;

// Tracked in  Issue 819244 
  NetworkQualityEstimator* network_quality_estimator_;

// Outside usages are only for BrowserDataRemover and are being converted by ericorth@.
  ReportingService* reporting_service_;
  NetworkErrorLoggingService* network_error_logging_service_;

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/17964a402c5428a73dd24492dbec32edffb0b16d

commit 17964a402c5428a73dd24492dbec32edffb0b16d
Author: Helen Li <xunjieli@chromium.org>
Date: Tue May 08 18:56:44 2018

Remove a few unused http_server_properties.h includes

Bug:  837333 
Change-Id: I7d8899093a74d1d6c0d3656ca1ddef8fbe547ea4
Reviewed-on: https://chromium-review.googlesource.com/1050469
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556903}
[modify] https://crrev.com/17964a402c5428a73dd24492dbec32edffb0b16d/chrome/browser/profiles/off_the_record_profile_impl.cc
[modify] https://crrev.com/17964a402c5428a73dd24492dbec32edffb0b16d/chrome/browser/profiles/profile_impl_io_data.cc
[modify] https://crrev.com/17964a402c5428a73dd24492dbec32edffb0b16d/chrome/browser/ui/webui/net_internals/net_internals_ui.cc

Good exercise, but largely uneventful. Matt's list is already pretty comprehensive.
 
https://groups.google.com/a/chromium.org/d/msg/network-service-dev/Sj5bU_3u8FI/M1IaMsktBAAJ

Thanks for taking the initiative to do this, Helen!  That surprises me - had been expecting there'd be more.