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

ppapi/proxy/pdf_resource.cc

Index: ppapi/proxy/pdf_resource.cc
diff --git a/ppapi/proxy/pdf_resource.cc b/ppapi/proxy/pdf_resource.cc
index 50370cf7cd5a47d36b13ff379097b5b760624a07..7d20d91026fc88b68cc44dc841985788a65b3fc5 100644
--- a/ppapi/proxy/pdf_resource.cc
+++ b/ppapi/proxy/pdf_resource.cc
@@ -28,7 +28,8 @@ namespace {
 std::string GetLocale() {
   // The browser process should have passed the locale to the plugin via the
   // --lang command line flag.
-  const CommandLine& parsed_command_line = *CommandLine::ForCurrentProcess();
+  const base::CommandLine& parsed_command_line =
+      *base::CommandLine::ForCurrentProcess();
   const std::string& lang = parsed_command_line.GetSwitchValueASCII("lang");
   DCHECK(!lang.empty());
   return lang;