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

chrome/browser/apps/guest_view/app_view_browsertest.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/strings/stringprintf.h"
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/test_utils.h"
@@ skipping 112 matching lines @@
             base::StringPrintf("runTest('%s', '%s')",
                                test_name.c_str(),
                                app_to_embed.c_str()))) {
       LOG(ERROR) << "UNABLE TO START TEST.";
       return;
     }
     ASSERT_TRUE(done_listener.WaitUntilSatisfied());
   }
 
  private:
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     extensions::PlatformAppBrowserTest::SetUpCommandLine(command_line);
   }
 
   TestGuestViewManagerFactory factory_;
 };
 
 // Tests that <appview> is able to navigate to another installed app.
 IN_PROC_BROWSER_TEST_F(AppViewTest, TestAppViewWithUndefinedDataShouldSucceed) {
   const extensions::Extension* skeleton_app =
       InstallPlatformApp("app_view/shim/skeleton");
@@ skipping 25 matching lines @@
 
 // Tests that <appview> correctly handles multiple successive connects.
 IN_PROC_BROWSER_TEST_F(AppViewTest, TestAppViewMultipleConnects) {
   const extensions::Extension* skeleton_app =
       InstallPlatformApp("app_view/shim/skeleton");
   TestHelper("testAppViewMultipleConnects",
              "app_view/shim",
              skeleton_app->id(),
              NO_TEST_SERVER);
 }