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

chrome/browser/extensions/api/preferences_private/preferences_private_apitest.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/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/ref_counted.h"
@@ skipping 93 matching lines @@
   mutable bool initialized_state_violation_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeProfileSyncService);
 };
 
 class PreferencesPrivateApiTest : public ExtensionApiTest {
  public:
   PreferencesPrivateApiTest() : browser_(NULL), service_(NULL) {}
   ~PreferencesPrivateApiTest() override {}
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
 #if defined(OS_CHROMEOS)
     command_line->AppendSwitch(
         chromeos::switches::kIgnoreUserProfileMappingForTests);
 #endif
   }
 
   void SetUpOnMainThread() override {
     ExtensionApiTest::SetUpOnMainThread();
 
     base::FilePath path;
@@ skipping 63 matching lines @@
 
 // Verifies that we wait for the sync service to be ready before checking
 // encryption status.
 IN_PROC_BROWSER_TEST_F(PreferencesPrivateApiTest,
                        GetSyncCategoriesWithoutPassphraseAsynchronous) {
   service_->set_sync_initialized(false);
   TestGetSyncCategoriesWithoutPassphraseFunction();
 }
 
 }  // namespace