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

chrome/browser/ui/webui/options/content_settings_handler.cc

Index: chrome/browser/ui/webui/options/content_settings_handler.cc
diff --git a/chrome/browser/ui/webui/options/content_settings_handler.cc b/chrome/browser/ui/webui/options/content_settings_handler.cc
index 08222e7a1bc01e2fa8da2e8417260e6d894b54d5..d7de5f4cae81fc783c84d699529bbb8b0221a7f8 100644
--- a/chrome/browser/ui/webui/options/content_settings_handler.cc
+++ b/chrome/browser/ui/webui/options/content_settings_handler.cc
@@ -969,7 +969,8 @@ void ContentSettingsHandler::UpdateMediaExceptionsView() {
 }
 
 void ContentSettingsHandler::UpdateMIDISysExExceptionsView() {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableWebMIDI)) {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableWebMIDI)) {
     web_ui()->CallJavascriptFunction(
         "ContentSettings.showExperimentalWebMIDISettings",
         base::FundamentalValue(true));