mac: Fix bookmark drag and drop.

components/bookmarks/browser/bookmark_pasteboard_helper_mac.h

Index: components/bookmarks/browser/bookmark_pasteboard_helper_mac.h
diff --git a/components/bookmarks/browser/bookmark_pasteboard_helper_mac.h b/components/bookmarks/browser/bookmark_pasteboard_helper_mac.h
index c0434185356ed9216ea545cadd2494bec4365bed..839fd510b3aa4fe00bd065b0b4a892a6895a0f1c 100644
--- a/components/bookmarks/browser/bookmark_pasteboard_helper_mac.h
+++ b/components/bookmarks/browser/bookmark_pasteboard_helper_mac.h
@@ -8,6 +8,7 @@
 #include "components/bookmarks/browser/bookmark_node_data.h"
 
 #if defined(__OBJC__)
+@class NSPasteboardItem;
 @class NSString;
 #endif  // __OBJC__
 
@@ -20,6 +21,13 @@ namespace bookmarks {
 // This set of functions lets C++ code interact with the cocoa pasteboard and
 // dragging methods.
 
+#if defined(__OBJC__)
+// Creates a NSPasteboardItem that contains all the data for the bookmarks.
+NSPasteboardItem* PasteboardItemFromBookmarks(
+    const std::vector<BookmarkNodeData::Element>& elements,
+    const base::FilePath& profile_path);
+#endif  // __OBJC__
+
 // Writes a set of bookmark elements from a profile to the specified pasteboard.
 void WriteBookmarksToPasteboard(
     ui::ClipboardType type,