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

chrome/browser/chromeos/login/demo_mode/demo_app_launcher_browsertest.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/basictypes.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 48 matching lines @@
 }  // namespace
 
 class DemoAppLauncherTest : public ExtensionBrowserTest {
  public:
   DemoAppLauncherTest() {
     set_exit_when_last_browser_closes(false);
   }
 
   virtual ~DemoAppLauncherTest() {}
 
-  virtual void SetUpCommandLine(CommandLine* command_line) override {
+  virtual void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitch(switches::kLoginManager);
     command_line->AppendSwitch(switches::kForceLoginManagerInTests);
     command_line->AppendSwitchASCII(switches::kLoginProfile, "user");
 
     command_line->AppendSwitchASCII(switches::kDerelictIdleTimeout, "0");
     command_line->AppendSwitchASCII(switches::kOobeTimerInterval, "0");
     command_line->AppendSwitchASCII(switches::kDerelictDetectionTimeout, "0");
   }
 
   virtual void SetUp() override {
@@ skipping 12 matching lines @@
   // did launch.
   EXPECT_TRUE(VerifyDemoAppLaunch());
 }
 
 IN_PROC_BROWSER_TEST_F(DemoAppLauncherTest, NoNetwork) {
   EXPECT_TRUE(VerifyDemoAppLaunch());
   EXPECT_TRUE(VerifyNetworksDisabled());
 }
 
 }  // namespace chromeos