Make a copy of PageClassification enum outside the metrics code

chrome/browser/omnibox/omnibox_log.cc

 // 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.
 
 #include "chrome/browser/omnibox/omnibox_log.h"
 
 OmniboxLog::OmniboxLog(
     const string16& text,
     bool just_deleted_text,
     AutocompleteInput::Type input_type,
     size_t selected_index,
     SessionID::id_type tab_id,
-    metrics::OmniboxEventProto::PageClassification current_page_classification,
+    AutocompleteInput::PageClassification current_page_classification,
     base::TimeDelta elapsed_time_since_user_first_modified_omnibox,
     size_t completed_length,
     base::TimeDelta elapsed_time_since_last_change_to_default_match,
     const AutocompleteResult& result)
     : text(text),
       just_deleted_text(just_deleted_text),
       input_type(input_type),
       selected_index(selected_index),
       tab_id(tab_id),
       current_page_classification(current_page_classification),
       elapsed_time_since_user_first_modified_omnibox(
           elapsed_time_since_user_first_modified_omnibox),
       completed_length(completed_length),
       elapsed_time_since_last_change_to_default_match(
           elapsed_time_since_last_change_to_default_match),
       result(result),
       providers_info() {
 }
 
 OmniboxLog::~OmniboxLog() {}