Clean content_settings_pattern_parser.* from unnecessary dependencies.

chrome/common/content_settings_pattern_serializer.h

+// Copyright (c) 2014 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 CHROME_COMMON_CONTENT_SETTINGS_PATTERN_SERIALIZER_H_
+#define CHROME_COMMON_CONTENT_SETTINGS_PATTERN_SERIALIZER_H_
+
+#include "base/macros.h"
+
+namespace IPC {
+class Message;
+}
+
+class ContentSettingsPattern;
+class PickleIterator;
+
+class ContentSettingsPatternSerializer {
+ public:
+  // Serializes the pattern to an IPC message.
+  static void WriteToMessage(const ContentSettingsPattern& pattern,
+                             IPC::Message* m);
+  // Deserializes the pattern from the IPC message.
+  static bool ReadFromMessage(const IPC::Message* m, PickleIterator* iter,
+                              ContentSettingsPattern* pattern);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ContentSettingsPatternSerializer);
+};
+
+#endif  // CHROME_COMMON_CONTENT_SETTINGS_PATTERN_SERIALIZER_H_