Fix "unused variable" warnings.

chrome/browser/extensions/component_migration_helper.cc

 // 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.
 
 #include "chrome/browser/extensions/component_migration_helper.h"
 
 #include "base/stl_util.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system_impl.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/scoped_user_pref_update.h"
 #include "content/public/browser/browser_context.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/feature_switch.h"
 
 namespace extensions {
 
 ComponentMigrationHelper::ComponentMigrationHelper(
     Profile* profile,
     ComponentActionDelegate* delegate)
-    : profile_(profile),
-      delegate_(delegate),
+    : delegate_(delegate),
       extension_registry_(ExtensionRegistry::Get(profile)),
       pref_service_(profile->GetPrefs()),
       extension_system_(ExtensionSystem::Get(profile)),
       extension_registry_observer_(this) {
   DCHECK(delegate_);
   extension_registry_observer_.Add(extension_registry_);
 }
 
 ComponentMigrationHelper::~ComponentMigrationHelper() {}
 
@@ skipping 143 matching lines @@
 std::string ComponentMigrationHelper::GetActionIdForExtensionId(
     const ExtensionId& extension_id) const {
   for (const auto& i : migrated_actions_) {
     if (i.second == extension_id)
       return i.first;
   }
   return "";
 }
 
 }  // namespace extensions