Make callers of CommandLine use it via the base:: namespace.

chrome/browser/sync/test/integration/single_client_app_list_sync_test.cc

 // Copyright 2013 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 "base/basictypes.h"
 #include "base/command_line.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/test/integration/apps_helper.h"
 #include "chrome/browser/sync/test/integration/sync_app_list_helper.h"
 #include "chrome/browser/sync/test/integration/sync_integration_test_util.h"
@@ skipping 15 matching lines @@
 
 }  // namespace
 
 class SingleClientAppListSyncTest : public SyncTest {
  public:
   SingleClientAppListSyncTest() : SyncTest(SINGLE_CLIENT) {}
 
   ~SingleClientAppListSyncTest() override {}
 
   // SyncTest
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     SyncTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(app_list::switches::kEnableSyncAppList);
   }
 
   bool SetupClients() override {
     if (!SyncTest::SetupClients())
       return false;
 
     // Init SyncAppListHelper to ensure that the extension system is initialized
     // for each Profile.
@@ skipping 21 matching lines @@
   }
 
   app_list::AppListSyncableService* service =
       app_list::AppListSyncableServiceFactory::GetForProfile(verifier());
   ASSERT_EQ(kNumApps + kNumDefaultApps, service->GetNumSyncItemsForTest());
 
   ASSERT_TRUE(AwaitCommitActivityCompletion(GetSyncService((0))));
   ASSERT_TRUE(AllProfilesHaveSameAppListAsVerifier());
 
 }