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

chrome/browser/extensions/api/debugger/debugger_api.cc

Index: chrome/browser/extensions/api/debugger/debugger_api.cc
diff --git a/chrome/browser/extensions/api/debugger/debugger_api.cc b/chrome/browser/extensions/api/debugger/debugger_api.cc
index 811d5ddbfb5879d9d3ffcba19cfcd25572851afe..f927fcb3545f25721ea8c71a591f9a133f7161e7 100644
--- a/chrome/browser/extensions/api/debugger/debugger_api.cc
+++ b/chrome/browser/extensions/api/debugger/debugger_api.cc
@@ -586,8 +586,8 @@ bool DebuggerAttachFunction::RunAsync() {
   }
 
   infobars::InfoBar* infobar = NULL;
-  if (!CommandLine::ForCurrentProcess()->
-       HasSwitch(::switches::kSilentDebuggerExtensionAPI)) {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          ::switches::kSilentDebuggerExtensionAPI)) {
     // Do not attach to the target if for any reason the infobar cannot be shown
     // for this WebContents instance.
     infobar = ExtensionDevToolsInfoBarDelegate::Create(