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

chrome/browser/extensions/api/push_messaging/push_messaging_canary_test.cc

 // Copyright (c) 2012 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 <string>
 
 #include "base/strings/string16.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/push_messaging/sync_setup_helper.h"
@@ skipping 21 matching lines @@
 // checkin process.
 class PushMessagingCanaryTest : public ExtensionApiTest {
  public:
   PushMessagingCanaryTest() {
     sync_setup_helper_.reset(new SyncSetupHelper());
   }
 
   ~PushMessagingCanaryTest() override {}
 
   void SetUp() override {
-    CommandLine* command_line = CommandLine::ForCurrentProcess();
+    base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 
     ASSERT_TRUE(command_line->HasSwitch(kPasswordFileForTest));
     base::FilePath password_file =
         command_line->GetSwitchValuePath(kPasswordFileForTest);
     ASSERT_TRUE(sync_setup_helper_->ReadPasswordFile(password_file));
 
     // The test framework overrides any command line user-data-dir
     // argument with a /tmp/.org.chromium.Chromium.XXXXXX directory.
     // That happens in the ChromeTestLauncherDelegate, and affects
     // all unit tests (no opt out available).  It intentionally erases
@@ skipping 104 matching lines @@
       "startTestWithCredentials('%s', '%s', '%s');",
       client_id.c_str(), client_secret.c_str(), refresh_token.c_str()));
 
   browser()->tab_strip_model()->GetActiveWebContents()->GetMainFrame()->
       ExecuteJavaScript(script_string);
 
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
 }  // namespace extensions