Add base:: qualification to some CommandLine references in content.

content/browser/site_instance_impl.cc

Index: content/browser/site_instance_impl.cc
diff --git a/content/browser/site_instance_impl.cc b/content/browser/site_instance_impl.cc
index 102c06758f932e4ab86c9c1ae14e7f613c569e3e..6d5690d869d0319bac451718fd12ffac18164f26 100644
--- a/content/browser/site_instance_impl.cc
+++ b/content/browser/site_instance_impl.cc
@@ -337,7 +337,8 @@ void SiteInstanceImpl::RenderProcessHostDestroyed(RenderProcessHost* host) {
 void SiteInstanceImpl::LockToOrigin() {
   // We currently only restrict this process to a particular site if the
   // --enable-strict-site-isolation or --site-per-process flags are present.
-  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kEnableStrictSiteIsolation) ||
       command_line.HasSwitch(switches::kSitePerProcess)) {
     ChildProcessSecurityPolicyImpl* policy =