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

ppapi/nacl_irt/ppapi_dispatcher.cc

Index: ppapi/nacl_irt/ppapi_dispatcher.cc
diff --git a/ppapi/nacl_irt/ppapi_dispatcher.cc b/ppapi/nacl_irt/ppapi_dispatcher.cc
index a7c4c135604cb85b6fbd94df34b590d510718981..059be41853532e23ac17959b292757164dccd939 100644
--- a/ppapi/nacl_irt/ppapi_dispatcher.cc
+++ b/ppapi/nacl_irt/ppapi_dispatcher.cc
@@ -165,10 +165,10 @@ void PpapiDispatcher::OnMsgInitializeNaClDispatcher(
   }
 
   command_line_and_logging_initialized = true;
-  CommandLine::Init(0, NULL);
+  base::CommandLine::Init(0, NULL);
   for (size_t i = 0; i < args.switch_names.size(); ++i) {
     DCHECK(i < args.switch_values.size());
-    CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+    base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
         args.switch_names[i], args.switch_values[i]);
   }
   logging::LoggingSettings settings;