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

ui/views_content_client/views_content_main_delegate.cc

Index: ui/views_content_client/views_content_main_delegate.cc
diff --git a/ui/views_content_client/views_content_main_delegate.cc b/ui/views_content_client/views_content_main_delegate.cc
index 1fb3a6913e1c4eebe1b2ebe76ca609b8f237714c..c930577b7f193e94070e9a43d840091c4176f0dc 100644
--- a/ui/views_content_client/views_content_main_delegate.cc
+++ b/ui/views_content_client/views_content_main_delegate.cc
@@ -40,7 +40,8 @@ ViewsContentMainDelegate::~ViewsContentMainDelegate() {
 }
 
 bool ViewsContentMainDelegate::BasicStartupComplete(int* exit_code) {
-  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
   std::string process_type =
       command_line.GetSwitchValueASCII(switches::kProcessType);