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

chrome/browser/media_galleries/media_galleries_permission_controller_unittest.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/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/run_loop.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
@@ skipping 43 matching lines @@
     EXPECT_FALSE(dialog_);
   }
 
   void SetUp() override {
     ASSERT_TRUE(TestStorageMonitor::CreateAndInstall());
 
     extensions::TestExtensionSystem* extension_system(
         static_cast<extensions::TestExtensionSystem*>(
             extensions::ExtensionSystem::Get(profile_.get())));
     extension_system->CreateExtensionService(
-        CommandLine::ForCurrentProcess(), base::FilePath(), false);
+        base::CommandLine::ForCurrentProcess(), base::FilePath(), false);
 
     gallery_prefs_.reset(new MediaGalleriesPreferences(profile_.get()));
     base::RunLoop loop;
     gallery_prefs_->EnsureInitialized(loop.QuitClosure());
     loop.Run();
 
     std::vector<std::string> read_permissions;
     read_permissions.push_back(
         extensions::MediaGalleriesPermission::kReadPermission);
     extension_ = AddMediaGalleriesApp("read", read_permissions, profile_.get());
@@ skipping 221 matching lines @@
 
   gallery.volume_label = base::string16();
   EXPECT_EQ("vendor, model", GalleryName(gallery));
 
   gallery.total_size_in_bytes = 1000000;
   EXPECT_EQ("977 KB vendor, model", GalleryName(gallery));
 
   gallery.path = base::FilePath(FILE_PATH_LITERAL("sub/path"));
   EXPECT_EQ("path - 977 KB vendor, model", GalleryName(gallery));
 }