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

chrome/browser/extensions/external_component_loader.cc

 // Copyright (c) 2013 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 "chrome/browser/extensions/external_component_loader.h"
 
 #include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/bookmarks/enhanced_bookmarks_features.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 57 matching lines @@
     if (GetBookmarksExperimentExtensionID(profile_->GetPrefs(),
                                           &extension_id) &&
         !extension_id.empty()) {
       prefs_->SetString(extension_id + ".external_update_url",
                         extension_urls::GetWebstoreUpdateUrl().spec());
     }
   }
 
 #if defined(OS_CHROMEOS)
   {
-    CommandLine* const command_line = CommandLine::ForCurrentProcess();
+    base::CommandLine* const command_line =
+        base::CommandLine::ForCurrentProcess();
     if (!command_line->HasSwitch(chromeos::switches::kDisableNewZIPUnpacker)) {
       const std::string extension_id = extension_misc::kZIPUnpackerExtensionId;
       prefs_->SetString(extension_id + ".external_update_url",
                         extension_urls::GetWebstoreUpdateUrl().spec());
     }
   }
 #endif
 
   LoadFinished();
 }
 
 }  // namespace extensions