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

chrome/browser/resources/pdf/pdf_extension_test.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/base_paths.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/manifest_handlers/mime_types_handler.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/test/browser_test_utils.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/test/result_catcher.h"
 #include "grit/browser_resources.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
 class PDFExtensionTest : public ExtensionApiTest {
  public:
   virtual ~PDFExtensionTest() {}
 
-  virtual void SetUpCommandLine(CommandLine* command_line) override {
+  virtual void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kEnableOutOfProcessPdf);
   }
 
   virtual void SetUpOnMainThread() override {
     ExtensionApiTest::SetUpOnMainThread();
     ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
   }
 
 
@@ skipping 53 matching lines @@
   RunTestsInFile("basic_test.js", false);
 }
 
 IN_PROC_BROWSER_TEST_F(PDFExtensionTest, BasicPlugin) {
   RunTestsInFile("basic_plugin_test.js", true);
 }
 
 IN_PROC_BROWSER_TEST_F(PDFExtensionTest, Viewport) {
   RunTestsInFile("viewport_test.js", false);
 }