Convert some GN test support targets to static libs.

components/os_crypt/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
-source_set("os_crypt") {
+static_library("os_crypt") {
   sources = [
     "ie7_password_win.cc",
     "ie7_password_win.h",
     "keychain_password_mac.h",
     "keychain_password_mac.mm",
     "os_crypt.h",
     "os_crypt_mac.mm",
     "os_crypt_posix.cc",
     "os_crypt_switches.cc",
     "os_crypt_switches.h",
@@ skipping 49 matching lines @@
       sources += [
         "kwallet_dbus.cc",
         "kwallet_dbus.h",
       ]
       deps += [ "//dbus" ]
       defines += [ "USE_KWALLET" ]
     }
   }
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   sources = [
     "os_crypt_mocker.cc",
     "os_crypt_mocker.h",
   ]
   deps = [
     ":os_crypt",
     "//base",
     "//testing/gtest",
   ]
@@ skipping 27 matching lines @@
     sources += [ "os_crypt_linux_unittest.cc" ]
     defines = []
 
     if (use_glib) {
       sources += [ "os_crypt_util_linux_unittest.cc" ]
       deps += [ "//third_party/libsecret" ]
       defines += [ "USE_LIBSECRET" ]
     }
     if (use_dbus) {
       sources += [ "kwallet_dbus_unittest.cc" ]
-      deps += [
-        "//dbus",
-        "//dbus:test_support",
-      ]
+      deps += [ "//dbus:test_support" ]
       defines += [ "USE_KWALLET" ]
     }
   }
 }