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

chrome/browser/extensions/api/braille_display_private/braille_display_private_apitest.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 USE_BRLAPI
 #error This test requires brlapi.
 #endif
 
 #include <deque>
 
@@ skipping 250 matching lines @@
 IN_PROC_BROWSER_TEST_F(BrailleDisplayPrivateApiTest, DisplayStateChanges) {
   connection_data_.display_size = 11;
   connection_data_.pending_keys.push_back(kErrorKeyCode);
   connection_data_.reappear_on_disconnect = true;
   ASSERT_TRUE(RunComponentExtensionTest(
       "braille_display_private/display_state_changes"));
 }
 
 class BrailleDisplayPrivateAPIUserTest : public BrailleDisplayPrivateApiTest {
  public:
-  virtual void SetUpCommandLine(CommandLine* command_line) override {
+  virtual void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitch(chromeos::switches::kLoginManager);
     command_line->AppendSwitchASCII(chromeos::switches::kLoginProfile,
                                     TestingProfile::kTestUserProfileDir);
   }
 
   class MockEventDelegate : public BrailleDisplayPrivateAPI::EventDelegate {
    public:
     MockEventDelegate() : event_count_(0) {}
 
     int GetEventCount() { return event_count_; }
@@ skipping 82 matching lines @@
   DismissLockScreen(tester.get());
   signin_api.OnBrailleKeyEvent(key_event);
   user_api.OnBrailleKeyEvent(key_event);
   EXPECT_EQ(1, signin_delegate->GetEventCount());
   EXPECT_EQ(2, user_delegate->GetEventCount());
 }
 
 }  // namespace braille_display_private
 }  // namespace api
 }  // namespace extensions