Remove set_sources_assignment_filter from //components/update_client

set_sources_assignment_filter() is considered as a mis-feature
of gn (as it makes it difficult to reason about the BUILD.gn
files individually).

Bug: 1018739
Change-Id: I0f59c9d6812ca93e2d7b5d100d7857467b685f42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414193
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807512}

components/update_client/BUILD.gn

@@ -5,6 +5,12 @@
 import("//net/features.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
+# Reset sources_assignment_filter for the BUILD.gn file to prevent
+# regression during the migration of Chromium away from the feature.
+# See docs/no_sources_assignment_filter.md for more information.
+# TODO(crbug.com/1018739): remove this when migration is done.
+set_sources_assignment_filter([])
+
 source_set("network_impl") {
   sources = [
     "net/network_chromium.h",
@@ -58,8 +64,6 @@ static_library("update_client") {
     "action_runner.cc",
     "action_runner.h",
     "activity_data_service.h",
-    "background_downloader_win.cc",
-    "background_downloader_win.h",
     "command_line_config_policy.cc",
     "command_line_config_policy.h",
     "component.cc",
@@ -120,8 +124,6 @@ static_library("update_client") {
     "update_query_params_delegate.h",
     "updater_state.cc",
     "updater_state.h",
-    "updater_state_mac.mm",
-    "updater_state_win.cc",
     "url_fetcher_downloader.cc",
     "url_fetcher_downloader.h",
     "utils.cc",
@@ -139,6 +141,18 @@ static_library("update_client") {
     "//crypto",
     "//url",
   ]
+
+  if (is_win) {
+    sources += [
+      "background_downloader_win.cc",
+      "background_downloader_win.h",
+      "updater_state_win.cc",
+    ]
+  }
+
+  if (is_mac) {
+    sources += [ "updater_state_mac.mm" ]
+  }
 }
 
 static_library("test_support") {