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

chrome/browser/ui/webui/local_discovery/local_discovery_ui_browsertest.cc

 // Copyright 2013 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/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 406 matching lines @@
         .Times(AnyNumber());
 
     ProfileOAuth2TokenService* token_service =
         ProfileOAuth2TokenServiceFactory::GetForProfile(browser()->profile());
 
     token_service->UpdateCredentials("user@host.com", "MyFakeToken");
 
     AddLibrary(base::FilePath(FILE_PATH_LITERAL("local_discovery_ui_test.js")));
   }
 
-  virtual void SetUpCommandLine(CommandLine* command_line) override {
+  virtual void SetUpCommandLine(base::CommandLine* command_line) override {
 #if defined(OS_CHROMEOS)
     // On chromeos, don't sign in with the stub-user automatically.  Use the
     // kLoginUser instead.
     command_line->AppendSwitchASCII(chromeos::switches::kLoginUser,
                                     kSampleUser);
     command_line->AppendSwitchASCII(chromeos::switches::kLoginProfile,
                                     chrome::kTestUserProfileDir);
 #endif
     WebUIBrowserTest::SetUpCommandLine(command_line);
   }
@@ skipping 128 matching lines @@
       kAnnouncePacketRegistered, sizeof(kAnnouncePacketRegistered));
 
   base::MessageLoop::current()->RunUntilIdle();
 
   EXPECT_TRUE(WebUIBrowserTest::RunJavascriptTest("expectRegisterDone"));
 }
 
 }  // namespace
 
 }  // namespace local_discovery