fix spelling of comments

chrome/browser/ui/cocoa/bookmarks/bookmark_button.h

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_button.h
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_button.h b/chrome/browser/ui/cocoa/bookmarks/bookmark_button.h
index 58651472e0d8f80f8353dc0185f27c3e4482ef35..02f7d06cfa739fb5af448c5fff4494c0c7798011 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_button.h
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_button.h
@@ -154,7 +154,7 @@ class ThemeProvider;
 // cut/paste/delete and drag/drop. Such changes may involve coordinating
 // the bookmark button contents of two controllers (such as when a bookmark is
 // dragged from one folder to another).  The bookmark bar controller
-// coordinates in response to notifications propogated by the bookmark model
+// coordinates in response to notifications propagated by the bookmark model
 // through BookmarkBarBridge calls. The following three functions are
 // implemented by the controllers and are dispatched by the bookmark bar
 // controller in response to notifications coming in from the BookmarkBarBridge.