Cleanup: Constify more ExtensionService methods, and IWYU.

chrome/browser/extensions/updater/extension_updater_unittest.cc

 // Copyright (c) 2012 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.
 
 #include <list>
 #include <map>
 #include <set>
 #include <vector>
 
+#include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/stl_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/threading/thread.h"
@@ skipping 283 matching lines @@
 };
 
 class ServiceForDownloadTests : public MockService {
  public:
   ServiceForDownloadTests()
       : MockService() {
   }
 
   // Add a fake crx installer to be returned by a call to UpdateExtension()
   // with a specific ID.  Caller keeps ownership of |crx_installer|.
-  void AddFakeCrxInstaller(std::string& id,
-                           CrxInstaller* crx_installer) {
+  void AddFakeCrxInstaller(const std::string& id, CrxInstaller* crx_installer) {
     fake_crx_installers_[id] = crx_installer;
   }
 
   bool UpdateExtension(
       const std::string& id,
       const FilePath& extension_path,
       const GURL& download_url,
       CrxInstaller** out_crx_installer) OVERRIDE {
     extension_id_ = id;
     install_path_ = extension_path;
@@ skipping 1179 matching lines @@
 // -prodversionmin (shouldn't update if browser version too old)
 // -manifests & updates arriving out of order / interleaved
 // -malformed update url (empty, file://, has query, has a # fragment, etc.)
 // -An extension gets uninstalled while updates are in progress (so it doesn't
 //  "come back from the dead")
 // -An extension gets manually updated to v3 while we're downloading v2 (ie
 //  you don't get downgraded accidentally)
 // -An update manifest mentions multiple updates
 
 }  // namespace extensions