Revert everything related to the relanding.

Review URL: http://codereview.chromium.org/2982009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@52367 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/observer_list_threadsafe.h b/base/observer_list_threadsafe.h
index f7dabef..62db5dc 100644
--- a/base/observer_list_threadsafe.h
+++ b/base/observer_list_threadsafe.h
@@ -5,9 +5,8 @@
 #ifndef BASE_OBSERVER_LIST_THREADSAFE_H_
 #define BASE_OBSERVER_LIST_THREADSAFE_H_
 
-#include <algorithm>
-#include <map>
 #include <vector>
+#include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/callback.h"