[Extensions] Clean up some Permission[sData|Set] includes

extensions/common/permissions/permission_set.h

 // Copyright 2013 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.
 
 #ifndef EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_SET_H_
 #define EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_SET_H_
 
-#include <map>
 #include <set>
 #include <string>
-#include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/singleton.h"
-#include "base/strings/string16.h"
-#include "extensions/common/manifest.h"
 #include "extensions/common/permissions/api_permission.h"
 #include "extensions/common/permissions/api_permission_set.h"
 #include "extensions/common/permissions/manifest_permission.h"
 #include "extensions/common/permissions/manifest_permission_set.h"
 #include "extensions/common/url_pattern_set.h"
 
 namespace extensions {
-class Extension;
 
 // The PermissionSet is an immutable class that encapsulates an
 // extension's permissions. The class exposes set operations for combining and
 // manipulating the permissions.
 class PermissionSet
     : public base::RefCountedThreadSafe<PermissionSet> {
  public:
   // Creates an empty permission set (e.g. default permissions).
   PermissionSet();
 
@@ skipping 126 matching lines @@
   };
   // Whether or not this permission set includes access to so many origins, we
   // should treat it as all_hosts for warning purposes.
   // Lazily initialized (and therefore mutable).
   mutable ShouldWarnAllHostsType should_warn_all_hosts_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_SET_H_