Convert some component source sets to static library

components/gcm_driver/crypto/BUILD.gn

 # Copyright 2015 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/crypto.gni")
 
 # GYP version: components/gcm_driver.gypi:gcm_driver_crypto
-source_set("crypto") {
+static_library("crypto") {
   sources = [
     "encryption_header_parsers.cc",
     "encryption_header_parsers.h",
     "gcm_encryption_provider.cc",
     "gcm_encryption_provider.h",
     "gcm_key_store.cc",
     "gcm_key_store.h",
     "gcm_message_cryptographer.cc",
     "gcm_message_cryptographer.h",
     "p256_key_util.cc",
@@ skipping 43 matching lines @@
     "//base",
     "//base/test:test_support",
     "//components/gcm_driver/common",
     "//crypto",
     "//crypto:platform",
     "//net:test_support",
     "//testing/gtest",
     "//third_party/protobuf:protobuf_lite",
   ]
 }