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

win8/metro_driver/metro_driver.cc

Index: win8/metro_driver/metro_driver.cc
diff --git a/win8/metro_driver/metro_driver.cc b/win8/metro_driver/metro_driver.cc
index a60af6b2405a054d3d6c17282d731fd06bcaf6a1..4eedfdc0ae31d9a6b7f99f28601691debfdb85f8 100644
--- a/win8/metro_driver/metro_driver.cc
+++ b/win8/metro_driver/metro_driver.cc
@@ -85,7 +85,7 @@ int InitMetro() {
   if (base::win::GetVersion() < base::win::VERSION_WIN7)
     return 1;
   // Initialize the command line.
-  CommandLine::Init(0, NULL);
+  base::CommandLine::Init(0, NULL);
   // Initialize the logging system.
   logging::LoggingSettings settings;
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;