Mac: clang build

chrome/browser/cocoa/bookmark_bar_controller.mm

Index: chrome/browser/cocoa/bookmark_bar_controller.mm
diff --git a/chrome/browser/cocoa/bookmark_bar_controller.mm b/chrome/browser/cocoa/bookmark_bar_controller.mm
index 9c6f8d57c1274776ae32efbaff7656a26b674800..0c7ec9d459394aa850e878637b1839ece0606b4b 100644
--- a/chrome/browser/cocoa/bookmark_bar_controller.mm
+++ b/chrome/browser/cocoa/bookmark_bar_controller.mm
@@ -874,7 +874,12 @@ const NSTimeInterval kBookmarkBarAnimationDuration = 0.12;
 
 // Enable or disable items.  We are the menu delegate for both the bar
 // and for bookmark folder buttons.
-- (BOOL)validateUserInterfaceItem:(id)item {
+- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)anItem {
+  // NSUserInterfaceValidations says that the passed-in object has type
+  // |id<NSValidatedUserInterfaceItem>|, but this function needs to call the
+  // NSObject method -isKindOfClass: on the parameter. In theory, this is not
+  // correct, but this is probably a bug in the method signature.
+  NSMenuItem* item = static_cast<NSMenuItem*>(anItem);
   // Yes for everything we don't explicitly deny.
   if (![item isKindOfClass:[NSMenuItem class]])
     return YES;