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

chrome/browser/extensions/process_management_browsertest.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 "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 11 matching lines @@
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
 using content::NavigationController;
 using content::WebContents;
 
 namespace {
 
 class ProcessManagementTest : public ExtensionBrowserTest {
  private:
   // This is needed for testing isolated apps, which are still experimental.
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionBrowserTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(
         extensions::switches::kEnableExperimentalExtensionApis);
   }
 };
 
 }  // namespace
 
 
 // TODO(nasko): crbug.com/173137
@@ skipping 192 matching lines @@
   }
 
   // We've loaded 5 extensions with background pages, 1 extension without
   // background page, and one isolated app. We expect only 2 unique processes
   // hosting those extensions.
   extensions::ProcessMap* process_map = extensions::ProcessMap::Get(profile);
 
   EXPECT_GE((size_t) 6, process_map->size());
   EXPECT_EQ((size_t) 2, process_ids.size());
 }