Move MockBookmarkModelObserver into bookmarks namespace.

components/bookmarks/test/mock_bookmark_model_observer.h

 // Copyright 2014 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.
 
 #include "components/bookmarks/browser/bookmark_model_observer.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "url/gurl.h"
 
+namespace bookmarks {
+
 class MockBookmarkModelObserver : public BookmarkModelObserver {
  public:
   MockBookmarkModelObserver();
   virtual ~MockBookmarkModelObserver();
 
   MOCK_METHOD2(BookmarkModelLoaded, void(BookmarkModel*, bool));
 
   MOCK_METHOD5(BookmarkNodeMoved, void(BookmarkModel*,
                                        const BookmarkNode*,
                                        int,
@@ skipping 14 matching lines @@
 
   MOCK_METHOD2(BookmarkNodeFaviconChanged, void(BookmarkModel*,
                                                 const BookmarkNode*));
 
   MOCK_METHOD2(BookmarkNodeChildrenReordered, void(BookmarkModel*,
                                                    const BookmarkNode*));
 
   MOCK_METHOD2(BookmarkAllUserNodesRemoved, void(BookmarkModel*,
                                                  const std::set<GURL>&));
 };
+
+}  // namespace bookmarks