[Mac] Replace the custom bookmark menus with native NSMenus.

chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.mm
index b81ca381f4a75fb17535ac423a8987b85f39a9be..10cafdb965e672bc513f5cea750ef2145e461005 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.mm
@@ -26,6 +26,8 @@ const NSUInteger kMaximumMenuPixelsWide = 300;
 
 @implementation BookmarkMenuCocoaController
 
+@synthesize delegate = delegate_;
+
 + (NSString*)menuTitleForNode:(const BookmarkNode*)node {
   NSFont* nsfont = [NSFont menuBarFontOfSize:0];  // 0 means "default"
   gfx::Font font(base::SysNSStringToUTF16([nsfont fontName]),
@@ -74,11 +76,25 @@ const NSUInteger kMaximumMenuPixelsWide = 300;
   return [controller keyWindowIsNotModal];
 }
 
+// NSMenuDelegate //////////////////////////////////////////////////////////////
+
 // NSMenu delegate method: called just before menu is displayed.
 - (void)menuNeedsUpdate:(NSMenu*)menu {
   bridge_->UpdateMenu(menu);
 }
 
+- (void)menuWillOpen:(NSMenu*)menu {
+  if ([delegate_ respondsToSelector:@selector(bookmarkMenuWillOpen:)])
+    [delegate_ bookmarkMenuWillOpen:self];
+}
+
+- (void)menuDidClose:(NSMenu*)menu {
+  if ([delegate_ respondsToSelector:@selector(bookmarkMenuDidClose:)])
+    [delegate_ bookmarkMenuDidClose:self];
+}
+
+// Private /////////////////////////////////////////////////////////////////////
+
 // Return the a BookmarkNode that has the given id (called
 // "identifier" here to avoid conflict with objc's concept of "id").
 - (const BookmarkNode*)nodeForIdentifier:(int)identifier {