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

chrome/browser/upgrade_detector.cc

Index: chrome/browser/upgrade_detector.cc
diff --git a/chrome/browser/upgrade_detector.cc b/chrome/browser/upgrade_detector.cc
index b8400359d0be3a5eff0c403f28944ecb62485128..fee2cb7feb5ab3e5e23c73ad1e1aaf6c2b83c590 100644
--- a/chrome/browser/upgrade_detector.cc
+++ b/chrome/browser/upgrade_detector.cc
@@ -26,7 +26,7 @@ bool UseTestingIntervals() {
   // If a command line parameter specifying how long the upgrade check should
   // be, we assume it is for testing and switch to using seconds instead of
   // hours.
-  const CommandLine& cmd_line = *CommandLine::ForCurrentProcess();
+  const base::CommandLine& cmd_line = *base::CommandLine::ForCurrentProcess();
   return !cmd_line.GetSwitchValueASCII(
       switches::kCheckForUpdateIntervalSec).empty();
 }