Make a copy of PageClassification enum outside the metrics code

chrome/browser/ui/omnibox/omnibox_edit_model.h

Index: chrome/browser/ui/omnibox/omnibox_edit_model.h
diff --git a/chrome/browser/ui/omnibox/omnibox_edit_model.h b/chrome/browser/ui/omnibox/omnibox_edit_model.h
index 4087b4d307cb5f61bdec6ddf07350be92cbf510d..d3498920521ef3154ddf0a30f80a266f77b7a9ad 100644
--- a/chrome/browser/ui/omnibox/omnibox_edit_model.h
+++ b/chrome/browser/ui/omnibox/omnibox_edit_model.h
@@ -13,7 +13,6 @@
 #include "chrome/browser/autocomplete/autocomplete_controller_delegate.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/ui/omnibox/omnibox_controller.h"
-#include "chrome/common/metrics/proto/omnibox_event.pb.h"
 #include "chrome/common/omnibox_focus_state.h"
 #include "content/public/common/page_transition_types.h"
 #include "ui/base/window_open_disposition.h"
@@ -387,7 +386,7 @@ class OmniboxEditModel {
   // page or a normal web page.  Used for logging omnibox events for
   // UMA opted-in users.  Examines the user's profile to determine if the
   // current page is the user's home page.
-  metrics::OmniboxEventProto::PageClassification ClassifyPage() const;
+  AutocompleteInput::PageClassification ClassifyPage() const;
 
   // Sets |match| and |alternate_nav_url| based on classifying |text|.
   // |alternate_nav_url| may be NULL.