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

content/browser/theme_helper_mac.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/theme_helper_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
 #include "base/mac/sdk_forward_declarations.h"
@@ skipping 35 matching lines @@
   [[NSDistributedNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(behaviorPrefsChanged:)
              name:@"AppleNoRedisplayAppearancePreferenceChanged"
            object:nil
 suspensionBehavior:NSNotificationSuspensionBehaviorCoalesce];
 
   // In single-process mode, renderers will catch these notifications
   // themselves and listening for them here may trigger the DCHECK in Observe().
   if ([NSScroller respondsToSelector:@selector(preferredScrollerStyle)] &&
-      !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess)) {
+      !base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kSingleProcess)) {
     [[NSNotificationCenter defaultCenter]
         addObserver:self
            selector:@selector(behaviorPrefsChanged:)
                name:NSPreferredScrollerStyleDidChangeNotification
              object:nil];
   }
 }
 
 + (void)appearancePrefsChanged:(NSNotification*)notification {
   [self notifyPrefsChangedWithRedraw:YES];
@@ skipping 74 matching lines @@
   RenderProcessHost* rph = Source<RenderProcessHost>(source).ptr();
   rph->Send(new ViewMsg_UpdateScrollbarTheme(
       [defaults floatForKey:@"NSScrollerButtonDelay"],
       [defaults floatForKey:@"NSScrollerButtonPeriod"],
       [defaults boolForKey:@"AppleScrollerPagingBehavior"],
       GetPreferredScrollerStyle(),
       false));
 }
 
 }  // namespace content