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

chrome/browser/dom_distiller/tab_utils_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 <string.h>
 
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/dom_distiller/dom_distiller_service_factory.h"
 #include "chrome/browser/dom_distiller/tab_utils.h"
@@ skipping 14 matching lines @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace dom_distiller {
 
 namespace {
 const char* kSimpleArticlePath = "/dom_distiller/simple_article.html";
 }  // namespace
 
 class DomDistillerTabUtilsBrowserTest : public InProcessBrowserTest {
  public:
-  void SetUpCommandLine(CommandLine* command_line) override {
+  void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitch(switches::kEnableDomDistiller);
   }
 };
 
 class WebContentsMainFrameHelper : public content::WebContentsObserver {
  public:
   WebContentsMainFrameHelper(content::WebContents* web_contents,
                              const base::Closure& callback)
       : callback_(callback) {
     content::WebContentsObserver::Observe(web_contents);
@@ skipping 34 matching lines @@
 
   // Verify the new URL is showing distilled content in a new WebContents.
   EXPECT_NE(initial_web_contents, after_web_contents);
   EXPECT_TRUE(
       after_web_contents->GetLastCommittedURL().SchemeIs(kDomDistillerScheme));
   EXPECT_EQ("Test Page Title",
             base::UTF16ToUTF8(after_web_contents->GetTitle()));
 }
 
 }  // namespace dom_distiller