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

chrome/browser/chromeos/login/users/user_manager_unittest.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 <cstdlib>
 #include <cstring>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 36 matching lines @@
         return NULL;
     }
     return new TestingProfile(file_path, NULL);
   }
 };
 
 
 class UserManagerTest : public testing::Test {
  protected:
   virtual void SetUp() override {
-    CommandLine& command_line = *CommandLine::ForCurrentProcess();
+    base::CommandLine& command_line = *base::CommandLine::ForCurrentProcess();
     command_line.AppendSwitch(::switches::kTestType);
     command_line.AppendSwitch(
         chromeos::switches::kIgnoreUserProfileMappingForTests);
 
     cros_settings_ = CrosSettings::Get();
 
     // Replace the real DeviceSettingsProvider with a stub.
     device_settings_provider_ =
         cros_settings_->GetProvider(chromeos::kReportDeviceVersionInfo);
     EXPECT_TRUE(device_settings_provider_);
@@ skipping 147 matching lines @@
       "user0@invalid.domain", "user0@invalid.domain", false);
   ResetUserManager();
 
   const user_manager::UserList* users =
       &user_manager::UserManager::Get()->GetUsers();
   EXPECT_EQ(1U, users->size());
   EXPECT_EQ((*users)[0]->email(), "owner@invalid.domain");
 }
 
 }  // namespace chromeos