Move bookmark_model_observer.h to the bookmarks component

components/bookmarks/core/browser/bookmark_model_observer.h

Index: components/bookmarks/core/browser/bookmark_model_observer.h
diff --git a/chrome/browser/bookmarks/bookmark_model_observer.h b/components/bookmarks/core/browser/bookmark_model_observer.h
similarity index 96%
rename from chrome/browser/bookmarks/bookmark_model_observer.h
rename to components/bookmarks/core/browser/bookmark_model_observer.h
index e03e65d1c6605ba4cd28bd1f3e562f3e4692ec3e..7b49c7cd5326be9c5d52877862e65990c7c763e4 100644
--- a/chrome/browser/bookmarks/bookmark_model_observer.h
+++ b/components/bookmarks/core/browser/bookmark_model_observer.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_OBSERVER_H_
-#define CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_OBSERVER_H_
+#ifndef COMPONENTS_BOOKMARKS_CORE_BROWSER_BOOKMARK_MODEL_OBSERVER_H_
+#define COMPONENTS_BOOKMARKS_CORE_BROWSER_BOOKMARK_MODEL_OBSERVER_H_
 
 class BookmarkModel;
 class BookmarkNode;
@@ -112,4 +112,4 @@ class BookmarkModelObserver {
   virtual ~BookmarkModelObserver() {}
 };
 
-#endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_OBSERVER_H_
+#endif  // COMPONENTS_BOOKMARKS_CORE_BROWSER_BOOKMARK_MODEL_OBSERVER_H_