Fix some TODO(GYP) in the GN build.

sync/tools/BUILD.gn

Index: sync/tools/BUILD.gn
diff --git a/sync/tools/BUILD.gn b/sync/tools/BUILD.gn
index 93c275f04d6fb265413c8c01f5dfc4ff5ea8b8af..102584241dfbd14576bd14db9059e30b6cd37c8e 100644
--- a/sync/tools/BUILD.gn
+++ b/sync/tools/BUILD.gn
@@ -4,61 +4,54 @@
 
 import("//testing/test.gni")
 
-if (is_linux && !is_chromeos) {
-  # TODO(GYP): Figure out which of these work and are needed on other platforms.
-  source_set("common") {
-    testonly = true
-
-    sources = [
-      "null_invalidation_state_tracker.cc",
-      "null_invalidation_state_tracker.h",
-    ]
-
-    deps = [
-      "//base",
-      "//components/invalidation/impl",
-      "//components/sync_driver",
-      "//sync",
-    ]
-  }
-
-  test("sync_listen_notifications") {
-    sources = [
-      "sync_listen_notifications.cc",
-    ]
-
-    defines = [ "SYNC_TEST" ]
-
-    deps = [
-      ":common",
-      "//base",
-      "//components/invalidation/impl",
-      "//components/sync_driver",
-      "//jingle:notifier",
-      "//net",
-      "//net:test_support",
-      "//sync",
-      "//sync:test_support_sync_core",
-    ]
-  }
-
-  test("sync_client") {
-    sources = [
-      "sync_client.cc",
-    ]
+source_set("common") {
+  testonly = true
+
+  sources = [
+    "null_invalidation_state_tracker.cc",
+    "null_invalidation_state_tracker.h",
+  ]
+
+  deps = [
+    "//base",
+    "//components/invalidation/impl",
+    "//components/sync_driver",
+    "//sync",
+  ]
+}
 
-    defines = [ "SYNC_TEST" ]
+test("sync_listen_notifications") {
+  sources = [
+    "sync_listen_notifications.cc",
+  ]
+
+  defines = [ "SYNC_TEST" ]
+
+  deps = [
+    ":common",
+    "//base",
+    "//components/invalidation/impl",
+    "//components/sync_driver",
+    "//jingle:notifier",
+    "//net:test_support",
+    "//sync:test_support_sync_core",
+  ]
+}
 
-    deps = [
-      ":common",
-      "//base",
-      "//components/invalidation/impl",
-      "//components/sync_driver",
-      "//jingle:notifier",
-      "//net",
-      "//net:test_support",
-      "//sync",
-      "//sync:test_support_sync_core",
-    ]
-  }
+test("sync_client") {
+  sources = [
+    "sync_client.cc",
+  ]
+
+  defines = [ "SYNC_TEST" ]
+
+  deps = [
+    ":common",
+    "//base",
+    "//components/invalidation/impl",
+    "//components/sync_driver",
+    "//jingle:notifier",
+    "//net:test_support",
+    "//sync:test_support_sync_core",
+  ]
 }