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

chrome/browser/sync/backup_rollback_controller_unittest.cc

Index: chrome/browser/sync/backup_rollback_controller_unittest.cc
diff --git a/chrome/browser/sync/backup_rollback_controller_unittest.cc b/chrome/browser/sync/backup_rollback_controller_unittest.cc
index 483221c7cd620802899bb1766e2cb3210674a9bd..9048077a04f8a891d1293a49d10af9446c6c2fe9 100644
--- a/chrome/browser/sync/backup_rollback_controller_unittest.cc
+++ b/chrome/browser/sync/backup_rollback_controller_unittest.cc
@@ -87,8 +87,8 @@ TEST_F(BackupRollbackControllerTest, StartBackup) {
 }
 
 TEST_F(BackupRollbackControllerTest, NoBackupIfDisabled) {
-  CommandLine::ForCurrentProcess()->AppendSwitch(
-        switches::kSyncDisableBackup);
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
+      switches::kSyncDisableBackup);
 
   base::RunLoop run_loop;
   EXPECT_FALSE(controller_->StartBackup());
@@ -130,8 +130,8 @@ TEST_F(BackupRollbackControllerTest, NoRollbackIfUserSignedIn) {
 TEST_F(BackupRollbackControllerTest, NoRollbackIfDisabled) {
   fake_prefs_.SetRemainingRollbackTries(1);
 
-  CommandLine::ForCurrentProcess()->AppendSwitch(
-        switches::kSyncDisableRollback);
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
+      switches::kSyncDisableRollback);
   EXPECT_FALSE(controller_->StartRollback());
   EXPECT_EQ(0, fake_prefs_.GetRemainingRollbackTries());