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

chrome/browser/first_run/upgrade_util_linux.cc

Index: chrome/browser/first_run/upgrade_util_linux.cc
diff --git a/chrome/browser/first_run/upgrade_util_linux.cc b/chrome/browser/first_run/upgrade_util_linux.cc
index abacf76108708c8d1ba742a4625df6083d65b8fb..25d959743822d859930da54eab6812a33618e46b 100644
--- a/chrome/browser/first_run/upgrade_util_linux.cc
+++ b/chrome/browser/first_run/upgrade_util_linux.cc
@@ -21,7 +21,7 @@ double saved_last_modified_time_of_exe = 0;
 
 namespace upgrade_util {
 
-bool RelaunchChromeBrowser(const CommandLine& command_line) {
+bool RelaunchChromeBrowser(const base::CommandLine& command_line) {
   base::LaunchOptions options;
   // Don't set NO_NEW_PRIVS on the relaunched browser process.
   options.allow_new_privs = true;