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

chrome/browser/google/chrome_google_url_tracker_client.cc

Index: chrome/browser/google/chrome_google_url_tracker_client.cc
diff --git a/chrome/browser/google/chrome_google_url_tracker_client.cc b/chrome/browser/google/chrome_google_url_tracker_client.cc
index d8bc86df9f982e7a8c746dc7d35e5d4f7968a17f..4abbb7e609e6c8ef58a6820d70e68668069859ee 100644
--- a/chrome/browser/google/chrome_google_url_tracker_client.cc
+++ b/chrome/browser/google/chrome_google_url_tracker_client.cc
@@ -45,7 +45,7 @@ bool ChromeGoogleURLTrackerClient::IsListeningForNavigationStart() {
 }
 
 bool ChromeGoogleURLTrackerClient::IsBackgroundNetworkingEnabled() {
-  return !CommandLine::ForCurrentProcess()->HasSwitch(
+  return !base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kDisableBackgroundNetworking);
 }