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

components/password_manager/core/browser/password_manager.cc

Index: components/password_manager/core/browser/password_manager.cc
diff --git a/components/password_manager/core/browser/password_manager.cc b/components/password_manager/core/browser/password_manager.cc
index a9b95a430ede672f89d5aa071d7576fc62696dd6..f2d1418ce4b24681d0a7a1a77b770fad148850b0 100644
--- a/components/password_manager/core/browser/password_manager.cc
+++ b/components/password_manager/core/browser/password_manager.cc
@@ -71,7 +71,7 @@ bool ShouldDropSyncCredential() {
   std::string group_name =
       base::FieldTrialList::FindFullName("PasswordManagerDropSyncCredential");
 
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kEnableDropSyncCredential))
     return true;