Mac/clang: Possibly contentious changes.

chrome/browser/cocoa/extensions/browser_actions_container_view.mm

Index: chrome/browser/cocoa/extensions/browser_actions_container_view.mm
diff --git a/chrome/browser/cocoa/extensions/browser_actions_container_view.mm b/chrome/browser/cocoa/extensions/browser_actions_container_view.mm
index e2576f1f0bbf44a1a4701f0ebe52225773bb8990..cf5087a36ba90bbcc2cedc124758cd60c84a859b 100644
--- a/chrome/browser/cocoa/extensions/browser_actions_container_view.mm
+++ b/chrome/browser/cocoa/extensions/browser_actions_container_view.mm
@@ -9,11 +9,11 @@
 #include "base/logging.h"
 #import "base/scoped_nsobject.h"
 
-extern const NSString* kBrowserActionGrippyDragStartedNotification =
+NSString* const kBrowserActionGrippyDragStartedNotification =
     @"BrowserActionGrippyDragStartedNotification";
-extern const NSString* kBrowserActionGrippyDraggingNotification =
+NSString* const kBrowserActionGrippyDraggingNotification =
     @"BrowserActionGrippyDraggingNotification";
-extern const NSString* kBrowserActionGrippyDragFinishedNotification =
+NSString* const kBrowserActionGrippyDragFinishedNotification =
     @"BrowserActionGrippyDragFinishedNotification";
 
 namespace {