Remove set_sources_assignment_filter from //ipc

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: I78aa860978a9d6426974b4f057fbc166b892a436
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2409904
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806978}

ipc/BUILD.gn

@@ -10,6 +10,12 @@ import("//testing/test.gni")
 import("//third_party/protobuf/proto_library.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.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([])
+
 buildflag_header("ipc_buildflags") {
   header = "ipc_buildflags.h"
 
@@ -117,10 +123,6 @@ component("ipc") {
 
 component("message_support") {
   sources = [
-    "handle_attachment_win.cc",
-    "handle_attachment_win.h",
-    "handle_win.cc",
-    "handle_win.h",
     "ipc_message.cc",
     "ipc_message.h",
     "ipc_message_attachment.cc",
@@ -136,12 +138,17 @@ component("message_support") {
     "ipc_platform_file.h",
     "ipc_sync_message.cc",
     "ipc_sync_message.h",
-    "mach_port_attachment_mac.cc",
-    "mach_port_attachment_mac.h",
-    "mach_port_mac.cc",
-    "mach_port_mac.h",
   ]
 
+  if (is_win) {
+    sources += [
+      "handle_attachment_win.cc",
+      "handle_attachment_win.h",
+      "handle_win.cc",
+      "handle_win.h",
+    ]
+  }
+
   if (is_posix || is_fuchsia) {
     sources += [
       "ipc_platform_file_attachment_posix.cc",
@@ -149,6 +156,15 @@ component("message_support") {
     ]
   }
 
+  if (is_mac) {
+    sources += [
+      "mach_port_attachment_mac.cc",
+      "mach_port_attachment_mac.h",
+      "mach_port_mac.cc",
+      "mach_port_mac.h",
+    ]
+  }
+
   if (is_fuchsia) {
     sources += [
       "handle_attachment_fuchsia.cc",