Cleanup: Change LogMostVisitedImpression|Navigation APIs to take an enum

chrome/renderer/searchbox/searchbox.cc

 // Copyright 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.
 
 #include "chrome/renderer/searchbox/searchbox.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
@@ skipping 251 matching lines @@
     uint64_t now = (base::TimeTicks::Now() - base::TimeTicks::UnixEpoch())
                        .InMilliseconds();
     DCHECK(now >= start);
     delta = base::TimeDelta::FromMilliseconds(now - start);
   }
   render_view()->Send(new ChromeViewHostMsg_LogEvent(
       render_view()->GetRoutingID(), page_seq_no_, event, delta));
 }
 
 void SearchBox::LogMostVisitedImpression(int position,
-                                         const base::string16& provider) {
+                                         NTPLoggingTileSource tile_source) {
   render_view()->Send(new ChromeViewHostMsg_LogMostVisitedImpression(
-      render_view()->GetRoutingID(), page_seq_no_, position, provider));
+      render_view()->GetRoutingID(), page_seq_no_, position, tile_source));
 }
 
 void SearchBox::LogMostVisitedNavigation(int position,
-                                         const base::string16& provider) {
+                                         NTPLoggingTileSource tile_source) {
   render_view()->Send(new ChromeViewHostMsg_LogMostVisitedNavigation(
-      render_view()->GetRoutingID(), page_seq_no_, position, provider));
+      render_view()->GetRoutingID(), page_seq_no_, position, tile_source));
 }
 
 void SearchBox::CheckIsUserSignedInToChromeAs(const base::string16& identity) {
   render_view()->Send(new ChromeViewHostMsg_ChromeIdentityCheck(
       render_view()->GetRoutingID(), page_seq_no_, identity));
 }
 
 void SearchBox::CheckIsUserSyncingHistory() {
   render_view()->Send(new ChromeViewHostMsg_HistorySyncCheck(
       render_view()->GetRoutingID(), page_seq_no_));
@@ skipping 243 matching lines @@
   embedded_search_request_params_ = EmbeddedSearchRequestParams();
   suggestion_ = InstantSuggestion();
   is_focused_ = false;
   is_key_capture_enabled_ = false;
   theme_info_ = ThemeBackgroundInfo();
 }
 
 void SearchBox::OnDestruct() {
   delete this;
 }