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

chrome/browser/metrics/metrics_services_manager.cc

Index: chrome/browser/metrics/metrics_services_manager.cc
diff --git a/chrome/browser/metrics/metrics_services_manager.cc b/chrome/browser/metrics/metrics_services_manager.cc
index 8465c0f87e42c529ab404817d12f6f334a9b9efe..c67f023ee73c052c15e3b10d159a6669f3f62694 100644
--- a/chrome/browser/metrics/metrics_services_manager.cc
+++ b/chrome/browser/metrics/metrics_services_manager.cc
@@ -89,7 +89,8 @@ bool MetricsServicesManager::IsMetricsReportingEnabled() const {
   // If the user permits metrics reporting with the checkbox in the
   // prefs, we turn on recording.  We disable metrics completely for
   // non-official builds, or when field trials are forced.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kForceFieldTrials))
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kForceFieldTrials))
     return false;
 
   bool enabled = false;