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

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

 // Copyright 2014 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/command_line.h"
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
 #include "base/test/test_timeouts.h"
@@ skipping 23 matching lines @@
 const char kUrl2[] = "http://map.google.com";
 const char kUrl3[] = "http://plus.google.com";
 }  // anonymous namespace
 
 class SingleClientBackupRollbackTest : public SyncTest {
  public:
   SingleClientBackupRollbackTest() : SyncTest(SINGLE_CLIENT) {}
   ~SingleClientBackupRollbackTest() override {}
 
   void DisableBackup() {
-    CommandLine::ForCurrentProcess()->AppendSwitch(
-          switches::kSyncDisableBackup);
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
+        switches::kSyncDisableBackup);
   }
 
   void DisableRollback() {
-    CommandLine::ForCurrentProcess()->AppendSwitch(
-          switches::kSyncDisableRollback);
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
+        switches::kSyncDisableRollback);
   }
 
   base::Time GetBackupDbLastModified() {
     base::RunLoop run_loop;
 
     base::Time backup_time;
     syncer::CheckSyncDbLastModifiedTime(
         GetProfile(0)->GetPath().Append(FILE_PATH_LITERAL("Sync Data Backup")),
         base::MessageLoopProxy::current(),
         base::Bind(&SingleClientBackupRollbackTest::CheckDbCallback,
@@ skipping 371 matching lines @@
   ASSERT_TRUE(rollback_checker.Wait());
   SyncBackendStoppedChecker shutdown_checker(GetSyncService(0));
   ASSERT_TRUE(shutdown_checker.Wait());
 
   // Verify bookmarks are unchanged.
   ASSERT_EQ(3, sub_folder->child_count());
   ASSERT_EQ(GURL(kUrl1), sub_folder->GetChild(0)->url());
   ASSERT_EQ(GURL(kUrl2), sub_folder->GetChild(1)->url());
   ASSERT_EQ(GURL(kUrl3), sub_folder->GetChild(2)->url());
 }