Move part of metrics from chrome/common to components

components/metrics/proto/omnibox_event.proto

 // Copyright (c) 2012 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.
 //
 // Stores information about an omnibox interaction.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
@@ skipping 224 matching lines @@
     // See AutocompleteController::ResetSession() for more details on the
     // definition of a session.
     // See chrome/browser/autocomplete/search_provider.cc for a specific usage
     // example.
     repeated fixed32 field_trial_triggered_in_session = 4;
   }
   // A list of diagnostic information about each provider.  Providers
   // will appear at most once in this list.
   repeated ProviderInfo provider_info = 12;
 }