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

chrome/browser/signin/signin_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.
 
 #ifndef CHROME_BROWSER_SIGNIN_SIGNIN_BROWSERTEST_H_
 #define CHROME_BROWSER_SIGNIN_SIGNIN_BROWSERTEST_H_
 
 #include "base/command_line.h"
 #include "chrome/browser/signin/chrome_signin_client.h"
 #include "chrome/browser/signin/chrome_signin_client_factory.h"
@@ skipping 18 matching lines @@
 #include "net/http/http_status_code.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_request_status.h"
 
 namespace {
 const char kNonSigninURL[] = "http://www.google.com";
 }
 
 class SigninBrowserTest : public InProcessBrowserTest {
  public:
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     https_server_.reset(new net::SpawnedTestServer(
         net::SpawnedTestServer::TYPE_HTTPS,
         net::SpawnedTestServer::kLocalhost,
         base::FilePath(FILE_PATH_LITERAL("chrome/test/data"))));
     ASSERT_TRUE(https_server_->Start());
 
     // Add a host resolver rule to map all outgoing requests to the test server.
     // This allows us to use "real" hostnames in URLs, which we can use to
     // create arbitrary SiteInstances.
     command_line->AppendSwitchASCII(
@@ skipping 192 matching lines @@
   EXPECT_EQ(skip_url, web_contents->GetLastCommittedURL());
   EXPECT_EQ(start_url, web_contents->GetVisibleURL());
 
   content::WindowedNotificationObserver observer(
       content::NOTIFICATION_LOAD_STOP,
       content::NotificationService::AllSources());
   observer.Wait();
   EXPECT_EQ(start_url, web_contents->GetLastCommittedURL());
 }
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_BROWSERTEST_H_