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

chrome/browser/extensions/startup_helper_browsertest.cc

 // Copyright (c) 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 <vector>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "chrome/browser/extensions/startup_helper.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 
 class StartupHelperBrowserTest : public InProcessBrowserTest {
  public:
   StartupHelperBrowserTest() {}
   ~StartupHelperBrowserTest() override {}
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitch(switches::kNoStartupWindow);
     PathService::Get(chrome::DIR_TEST_DATA, &test_data_dir_);
     test_data_dir_ = test_data_dir_.AppendASCII("extensions");
   }
 
  protected:
   base::FilePath test_data_dir_;
 };
 
 IN_PROC_BROWSER_TEST_F(StartupHelperBrowserTest, ValidateCrx) {
   // A list of crx file paths along with an expected result of valid (true) or
   // invalid (false).
   std::vector<std::pair<base::FilePath, bool> > expectations;
   expectations.push_back(
       std::make_pair(test_data_dir_.AppendASCII("good.crx"), true));
   expectations.push_back(
       std::make_pair(test_data_dir_.AppendASCII("good2.crx"), true));
   expectations.push_back(
       std::make_pair(test_data_dir_.AppendASCII("bad_underscore.crx"), true));
   expectations.push_back(
       std::make_pair(test_data_dir_.AppendASCII("bad_magic.crx"), false));
 
   for (std::vector<std::pair<base::FilePath, bool> >::iterator i =
            expectations.begin();
        i != expectations.end(); ++i) {
-    CommandLine command_line(CommandLine::NO_PROGRAM);
+    base::CommandLine command_line(base::CommandLine::NO_PROGRAM);
     const base::FilePath& path = i->first;
     command_line.AppendSwitchPath(switches::kValidateCrx, path);
 
     std::string error;
     extensions::StartupHelper helper;
     bool result = helper.ValidateCrx(command_line, &error);
     if (i->second) {
       EXPECT_TRUE(result) << path.LossyDisplayName()
                           << " expected to be valid but wasn't";
     } else {
       EXPECT_FALSE(result) << path.LossyDisplayName()
                            << " expected to be invalid but wasn't";
       EXPECT_FALSE(error.empty()) << "Error message wasn't set for "
                                   << path.LossyDisplayName();
     }
   }
 }