Move BookmarkNodeData into bookmarks namespace.

chrome/browser/ui/bookmarks/bookmark_tab_helper.h

Index: chrome/browser/ui/bookmarks/bookmark_tab_helper.h
diff --git a/chrome/browser/ui/bookmarks/bookmark_tab_helper.h b/chrome/browser/ui/bookmarks/bookmark_tab_helper.h
index c8bef0417de0da4167fc93ed38c2ae930de41015..fcb07db65f9e32ba56e0980376961cfdc64bf93d 100644
--- a/chrome/browser/ui/bookmarks/bookmark_tab_helper.h
+++ b/chrome/browser/ui/bookmarks/bookmark_tab_helper.h
@@ -9,9 +9,12 @@
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
-struct BookmarkNodeData;
 class BookmarkTabHelperDelegate;
 
+namespace bookmarks {
+struct BookmarkNodeData;
+}
+
 namespace content {
 class WebContents;
 }
@@ -25,10 +28,10 @@ class BookmarkTabHelper
   // Interface for forwarding bookmark drag and drop to extenstions.
   class BookmarkDrag {
    public:
-    virtual void OnDragEnter(const BookmarkNodeData& data) = 0;
-    virtual void OnDragOver(const BookmarkNodeData& data) = 0;
-    virtual void OnDragLeave(const BookmarkNodeData& data) = 0;
-    virtual void OnDrop(const BookmarkNodeData& data) = 0;
+    virtual void OnDragEnter(const bookmarks::BookmarkNodeData& data) = 0;
+    virtual void OnDragOver(const bookmarks::BookmarkNodeData& data) = 0;
+    virtual void OnDragLeave(const bookmarks::BookmarkNodeData& data) = 0;
+    virtual void OnDrop(const bookmarks::BookmarkNodeData& data) = 0;
 
    protected:
     virtual ~BookmarkDrag() {}