Remove uses of base::hash_map from //chrome

chrome/browser/chromeos/login/users/chrome_user_manager_impl.h

Index: chrome/browser/chromeos/login/users/chrome_user_manager_impl.h
diff --git a/chrome/browser/chromeos/login/users/chrome_user_manager_impl.h b/chrome/browser/chromeos/login/users/chrome_user_manager_impl.h
index 4ef6942a310f2574e387d5e73b23054dcba2422f..a3f4eba8a8de0109e2ea066b9460c3778a952c16 100644
--- a/chrome/browser/chromeos/login/users/chrome_user_manager_impl.h
+++ b/chrome/browser/chromeos/login/users/chrome_user_manager_impl.h
@@ -10,7 +10,6 @@
 #include <string>
 #include <vector>
 
-#include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ -178,8 +177,7 @@ class ChromeUserManagerImpl
   friend class WallpaperManager;
   friend class WallpaperManagerTest;
 
-  using UserImageManagerMap =
-      base::hash_map<AccountId, linked_ptr<UserImageManager> >;
+  using UserImageManagerMap = std::map<AccountId, linked_ptr<UserImageManager>>;
 
   ChromeUserManagerImpl();