Make a copy of PageClassification enum outside the metrics code

chrome/browser/omnibox/omnibox_log.h

Index: chrome/browser/omnibox/omnibox_log.h
diff --git a/chrome/browser/omnibox/omnibox_log.h b/chrome/browser/omnibox/omnibox_log.h
index a31c9c7cedb86482615ba37b41a25a93b010c6b1..2b3d5aa3abfdabd32bf805204c73645d98bd0101 100644
--- a/chrome/browser/omnibox/omnibox_log.h
+++ b/chrome/browser/omnibox/omnibox_log.h
@@ -12,7 +12,6 @@
 #include "chrome/browser/autocomplete/autocomplete_input.h"
 #include "chrome/browser/autocomplete/autocomplete_provider.h"
 #include "chrome/browser/sessions/session_id.h"
-#include "chrome/common/metrics/proto/omnibox_event.pb.h"
 
 class AutocompleteResult;
 
@@ -25,8 +24,7 @@ struct OmniboxLog {
       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,
@@ -52,7 +50,7 @@ struct OmniboxLog {
 
   // The type of page (e.g., new tab page, regular web page) that the
   // user was viewing before going somewhere with the omnibox.
-  metrics::OmniboxEventProto::PageClassification current_page_classification;
+  AutocompleteInput::PageClassification current_page_classification;
 
   // The amount of time since the user first began modifying the text
   // in the omnibox.  If at some point after modifying the text, the