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

chrome/browser/extensions/extension_action_icon_factory_unittest.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 "chrome/browser/extensions/extension_action_icon_factory.h"
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 115 matching lines @@
     if (extension.get())
       extension_service_->AddExtension(extension.get());
     return extension;
   }
 
   // testing::Test overrides:
   void SetUp() override {
     file_thread_.Start();
     io_thread_.Start();
     profile_.reset(new TestingProfile);
-    CommandLine command_line(CommandLine::NO_PROGRAM);
+    base::CommandLine command_line(base::CommandLine::NO_PROGRAM);
     extension_service_ = static_cast<extensions::TestExtensionSystem*>(
         extensions::ExtensionSystem::Get(profile_.get()))->
         CreateExtensionService(&command_line, base::FilePath(), false);
   }
 
   void TearDown() override {
     profile_.reset();  // Get all DeleteSoon calls sent to ui_loop_.
     ui_loop_.RunUntilIdle();
   }
 
@@ skipping 143 matching lines @@
   icon = icon_factory.GetIcon(1);
 
   EXPECT_TRUE(ImageRepsAreEqual(
       default_icon.ToImageSkia()->GetRepresentation(1.0f),
       icon.ToImageSkia()->GetRepresentation(1.0f)));
 
 }
 
 }  // namespace
 }  // namespace extensions