Convert some component source sets to static library

components/leveldb/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.
 
 import("//services/shell/public/cpp/service.gni")
 import("//services/shell/public/service_manifest.gni")
 import("//testing/test.gni")
 
-source_set("lib") {
+static_library("lib") {
   sources = [
     "env_mojo.cc",
     "env_mojo.h",
     "leveldb_database_impl.cc",
     "leveldb_database_impl.h",
     "leveldb_mojo_proxy.cc",
     "leveldb_mojo_proxy.h",
     "leveldb_service_impl.cc",
     "leveldb_service_impl.h",
   ]
@@ skipping 61 matching lines @@
     ":leveldb",
     "//components/filesystem:filesystem",
   ]
 }
 
 service_manifest("test_manifest") {
   type = "exe"
   name = "leveldb_service_unittests"
   source = "test_manifest.json"
 }