Cleanup: Change LogMostVisitedImpression|Navigation APIs to take an enum

chrome/renderer/searchbox/searchbox.cc

Index: chrome/renderer/searchbox/searchbox.cc
diff --git a/chrome/renderer/searchbox/searchbox.cc b/chrome/renderer/searchbox/searchbox.cc
index ae07c78cc626133819398c6fa4b7d83f13276449..5e6374576145ec15833e6bac4a07c2d41c3bac57 100644
--- a/chrome/renderer/searchbox/searchbox.cc
+++ b/chrome/renderer/searchbox/searchbox.cc
@@ -269,15 +269,15 @@ void SearchBox::LogEvent(NTPLoggingEventType event) {
 }
 
 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) {