Convert some component source sets to static library

components/password_manager/content/public/cpp/BUILD.gn

 # Copyright 2016 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.
 
-source_set("cpp") {
+static_library("cpp") {
   sources = [
     "type_converters.cc",
     "type_converters.h",
   ]
 
   public_deps = [
     "../interfaces",
   ]
 
   deps = [
     "//base",
     "//components/password_manager/core/common",
     "//mojo/common:common_base",
     "//mojo/public/cpp/bindings",
     "//third_party/WebKit/public:blink_headers",
   ]
 }