Move CommandLine to base namespace.

chrome/app/chrome_main_delegate.h

Index: chrome/app/chrome_main_delegate.h
diff --git a/chrome/app/chrome_main_delegate.h b/chrome/app/chrome_main_delegate.h
index f4a105b9c5a5c94ef9bc2318ac050286ca04b9e5..5b651feb5ec73d93caeb3a51ab2e0bb4c431e4a9 100644
--- a/chrome/app/chrome_main_delegate.h
+++ b/chrome/app/chrome_main_delegate.h
@@ -10,6 +10,10 @@
 #include "chrome/common/chrome_content_client.h"
 #include "content/public/app/content_main_delegate.h"
 
+namespace base {
+class CommandLine;
+}
+
 // Chrome implementation of ContentMainDelegate.
 class ChromeMainDelegate : public content::ContentMainDelegate {
  public:
@@ -42,7 +46,7 @@ class ChromeMainDelegate : public content::ContentMainDelegate {
   virtual content::ContentUtilityClient* CreateContentUtilityClient() OVERRIDE;
 
 #if defined(OS_MACOSX)
-  void InitMacCrashReporter(const CommandLine& command_line,
+  void InitMacCrashReporter(const base::CommandLine& command_line,
                             const std::string& process_type);
 #endif  // defined(OS_MACOSX)