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

chrome/browser/ui/browser_tab_strip_model_delegate.cc

Index: chrome/browser/ui/browser_tab_strip_model_delegate.cc
diff --git a/chrome/browser/ui/browser_tab_strip_model_delegate.cc b/chrome/browser/ui/browser_tab_strip_model_delegate.cc
index 58e59990fcaa576bd19320b1b4597a72a695770d..3fcd43844e69e35756ac84a27bd84ac88c17f727 100644
--- a/chrome/browser/ui/browser_tab_strip_model_delegate.cc
+++ b/chrome/browser/ui/browser_tab_strip_model_delegate.cc
@@ -121,7 +121,7 @@ void BrowserTabStripModelDelegate::CreateHistoricalTab(
 
 bool BrowserTabStripModelDelegate::RunUnloadListenerBeforeClosing(
     content::WebContents* contents) {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableFastUnload)) {
     return chrome::FastUnloadController::RunUnloadEventsHelper(contents);
   }
@@ -130,7 +130,7 @@ bool BrowserTabStripModelDelegate::RunUnloadListenerBeforeClosing(
 
 bool BrowserTabStripModelDelegate::ShouldRunUnloadListenerBeforeClosing(
     content::WebContents* contents) {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableFastUnload)) {
     return chrome::FastUnloadController::ShouldRunUnloadEventsHelper(contents);
   }