Mac: Remove use of deprecated [NSNib instantiateNibWithOwner:topLevelObjects:].

ui/base/cocoa/nib_loading.mm

Index: ui/base/cocoa/nib_loading.mm
diff --git a/ui/base/cocoa/nib_loading.mm b/ui/base/cocoa/nib_loading.mm
index dd0eb48d806e1454028ada1c2b738b131d6b61ae..6deea19f698b4006a023f41257f5d214e1b30a24 100644
--- a/ui/base/cocoa/nib_loading.mm
+++ b/ui/base/cocoa/nib_loading.mm
@@ -7,6 +7,11 @@
 #include "base/mac/bundle_locations.h"
 #include "base/mac/scoped_nsobject.h"
 
+@interface NSNib (MountainLionSDK)
+- (BOOL)instantiateWithOwner:(nullable id)owner
+             topLevelObjects:(NSArray* __nonnull* __nullable)topLevelObjects;
+@end
+
 namespace ui {
 
 NSView* GetViewFromNib(NSString* name) {
@@ -17,18 +22,10 @@ NSView* GetViewFromNib(NSString* name) {
     return nil;
 
   NSArray* objects;
-  BOOL success = [nib instantiateNibWithOwner:nil
-                              topLevelObjects:&objects];
+  BOOL success = [nib instantiateWithOwner:nil topLevelObjects:&objects];
   if (!success)
     return nil;
 
-  // When loading a nib manually (as opposed to using an NSWindowController or
-  // NSViewController), all the top-level objects need to be explicitly
-  // released. See
-  // http://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/LoadingResources/CocoaNibs/CocoaNibs.html#//apple_ref/doc/uid/10000051i-CH4-SW10
-  // for more information.
-  [objects makeObjectsPerformSelector:@selector(release)];
-
   // For some strange reason, even nibs that appear to have but one top-level
   // object often have more (an NSApplication, etc.). Filter out what isn't
   // desired.