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

chrome/browser/ui/panels/panel_browsertest.cc

 // Copyright (c) 2012 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/bind.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/devtools/devtools_window.h"
@@ skipping 1740 matching lines @@
 
   // Panel should become visible when leaving full-screen mode.
   mock_display_settings_provider()->EnableFullScreenMode(false);
   EXPECT_TRUE(panel_testing->IsWindowVisible());
 
   PanelManager::GetInstance()->CloseAll();
 }
 
 class PanelExtensionApiTest : public ExtensionApiTest {
  protected:
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kEnablePanels);
   }
 };
 
 #if defined(OS_LINUX) || (!defined(OS_WIN) && defined(USE_AURA)) || \
     defined(OS_MACOSX)
 // Focus test fails if there is no window manager on Linux.
 // Aura panels have different behavior that do not apply to this test.
 #define MAYBE_FocusChangeEventOnMinimize DISABLED_FocusChangeEventOnMinimize
 #else
 #define MAYBE_FocusChangeEventOnMinimize FocusChangeEventOnMinimize
 #endif
 IN_PROC_BROWSER_TEST_F(PanelExtensionApiTest,
                        MAYBE_FocusChangeEventOnMinimize) {
   // This is needed so the subsequently created panels can be activated.
   // On a Mac, it transforms background-only test process into foreground one.
   ASSERT_TRUE(ui_test_utils::BringBrowserWindowToFront(browser()));
   ASSERT_TRUE(RunExtensionTest("panels/focus_change_on_minimize")) << message_;
 }