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

chrome/browser/net/connection_tester.cc

Index: chrome/browser/net/connection_tester.cc
diff --git a/chrome/browser/net/connection_tester.cc b/chrome/browser/net/connection_tester.cc
index ae905e02f5f8668a5461e1c9e15156720072981f..58def7168fd48134d0e614c4cbbd767152c4f4d9 100644
--- a/chrome/browser/net/connection_tester.cc
+++ b/chrome/browser/net/connection_tester.cc
@@ -185,8 +185,8 @@ class ExperimentURLRequestContext : public net::URLRequestContext {
       ConnectionTester::ProxySettingsExperiment experiment,
       scoped_ptr<net::ProxyConfigService>* proxy_config_service,
       scoped_ptr<net::ProxyService>* experiment_proxy_service) {
-    if (CommandLine::ForCurrentProcess()->HasSwitch(
-        switches::kSingleProcess)) {
+    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kSingleProcess)) {
       // We can't create a standard proxy resolver in single-process mode.
       // Rather than falling-back to some other implementation, fail.
       return net::ERR_NOT_IMPLEMENTED;