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

chrome/browser/extensions/api/cast_streaming/cast_streaming_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.
 
 #include <algorithm>
 #include <cmath>
 #include <vector>
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
@@ skipping 19 matching lines @@
 #include "net/base/rand_callback.h"
 #include "net/udp/udp_server_socket.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using media::cast::test::GetFreeLocalPort;
 
 namespace extensions {
 
 class CastStreamingApiTest : public ExtensionApiTest {
  public:
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitchASCII(
         extensions::switches::kWhitelistedExtensionID,
         "ddchlicdkolnonkihahngkmmmjnjlkkf");
     command_line->AppendSwitchASCII(::switches::kWindowSize, "300,300");
   }
 };
 
 // Test running the test extension for Cast Mirroring API.
 IN_PROC_BROWSER_TEST_F(CastStreamingApiTest, Basics) {
@@ skipping 263 matching lines @@
 };
 
 }  // namespace
 
 class CastStreamingApiTestWithPixelOutput : public CastStreamingApiTest {
   void SetUp() override {
     EnablePixelOutput();
     CastStreamingApiTest::SetUp();
   }
 
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitchASCII(::switches::kWindowSize, "128,128");
     CastStreamingApiTest::SetUpCommandLine(command_line);
   }
 };
 
 // Tests the Cast streaming API and its basic functionality end-to-end.  An
 // extension subtest is run to generate test content, capture that content, and
 // use the API to send it out.  At the same time, this test launches an
 // in-process Cast receiver, listening on a localhost UDP socket, to receive the
 // content and check whether it matches expectations.
@@ skipping 50 matching lines @@
 
   delete receiver;
   cast_environment->Shutdown();
 }
 
 IN_PROC_BROWSER_TEST_F(CastStreamingApiTestWithPixelOutput, RtpStreamError) {
   ASSERT_TRUE(RunExtensionSubtest("cast_streaming", "rtp_stream_error.html"));
 }
 
 }  // namespace extensions