Fix yet another crash with bookmarks drag&drop on Mac.

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

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view.h"
 
 #include "chrome/browser/bookmarks/bookmark_pasteboard_helper_mac.h"
 #include "chrome/browser/profiles/profile.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_button.h"
@@ skipping 204 matching lines @@
 - (BOOL)performDragOperationForBookmarkButton:(id<NSDraggingInfo>)info {
   BOOL rtn = NO;
   NSData* data = [[info draggingPasteboard]
                   dataForType:kBookmarkButtonDragType];
   // [info draggingSource] is nil if not the same application.
   if (data && [info draggingSource]) {
     BookmarkButton* button = nil;
     [data getBytes:&button length:sizeof(button)];
 
     // If we're dragging from one profile to another, disallow moving (only
-    // allow copying). Note that we need to call |GetOriginalProfile()| to make
-    // sure that Incognito profiles are handled correctly.
-    NSWindow* source_window = [[button delegate] browserWindow];
-    BrowserWindowController* source_window_controller =
-        [BrowserWindowController
-         browserWindowControllerForWindow:source_window];
-    const Profile* source_profile =
-        [source_window_controller profile]->GetOriginalProfile();
-    const Profile* target_profile =
-        [controller_ bookmarkModel]->profile()->GetOriginalProfile();
+    // allow copying). Each profile has its own bookmark model, so one way to
+    // check whether we are dragging across profiles is to see if the
+    // |BookmarkNode| corresponding to |button| exists in this profile. If it
+    // does, we're dragging within a profile; otherwise, we're dragging across
+    // profiles.
+    const BookmarkModel* const model = [[self controller] bookmarkModel];
+    const BookmarkNode* const source_node = [button bookmarkNode];
+    const BookmarkNode* const target_node =
+        model->GetNodeByID(source_node->id());
 
     BOOL copy =
         !([info draggingSourceOperationMask] & NSDragOperationMove) ||
-        source_profile != target_profile;
+        (source_node != target_node);
     rtn = [controller_ dragButton:button
                                to:[info draggingLocation]
                              copy:copy];
     UserMetrics::RecordAction(UserMetricsAction("BookmarkBar_DragEnd"));
   }
   return rtn;
 }
 
 - (BOOL)performDragOperation:(id<NSDraggingInfo>)info {
   if ([controller_ dragBookmarkData:info])
@@ skipping 13 matching lines @@
 
 - (void)setController:(id)controller {
   controller_ = controller;
 }
 
 - (ViewID)viewID {
   return VIEW_ID_BOOKMARK_BAR;
 }
 
 @end  // @implementation BookmarkBarView