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

chrome/browser/chromeos/net/network_portal_detector_impl.cc

Index: chrome/browser/chromeos/net/network_portal_detector_impl.cc
diff --git a/chrome/browser/chromeos/net/network_portal_detector_impl.cc b/chrome/browser/chromeos/net/network_portal_detector_impl.cc
index d1a31029f998e5eeb9ae6271ab03d1136effd267..7a81f0137ec9f8e10a3cd17e0b6006a0e1ce0244 100644
--- a/chrome/browser/chromeos/net/network_portal_detector_impl.cc
+++ b/chrome/browser/chromeos/net/network_portal_detector_impl.cc
@@ -221,7 +221,7 @@ void NetworkPortalDetectorImpl::Initialize(
     return;
   CHECK(!NetworkPortalDetector::network_portal_detector())
       << "NetworkPortalDetector was initialized twice.";
-  if (CommandLine::ForCurrentProcess()->HasSwitch(::switches::kTestType))
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(::switches::kTestType))
     set_network_portal_detector(new NetworkPortalDetectorStubImpl());
   else
     set_network_portal_detector(new NetworkPortalDetectorImpl(url_context));