Move CommandLine to base namespace.

chrome/app/chrome_main_delegate.cc

Index: chrome/app/chrome_main_delegate.cc
diff --git a/chrome/app/chrome_main_delegate.cc b/chrome/app/chrome_main_delegate.cc
index 26ef191816f50a4e3031549e0f1ba572076b8413..76592f17d5ec21344389fbe37b4b1d819409fcff 100644
--- a/chrome/app/chrome_main_delegate.cc
+++ b/chrome/app/chrome_main_delegate.cc
@@ -523,8 +523,9 @@ bool ChromeMainDelegate::BasicStartupComplete(int* exit_code) {
 }
 
 #if defined(OS_MACOSX)
-void ChromeMainDelegate::InitMacCrashReporter(const CommandLine& command_line,
-                                              const std::string& process_type) {
+void ChromeMainDelegate::InitMacCrashReporter(
+    const base::CommandLine& command_line,
+    const std::string& process_type) {
   // TODO(mark): Right now, InitCrashReporter() needs to be called after
   // CommandLine::Init() and chrome::RegisterPathProvider().  Ideally,
   // Breakpad initialization could occur sooner, preferably even before the