Rename VisitDatabaseObserver to HistoryServiceObserver

chrome/browser/history/chrome_history_client.h

Index: chrome/browser/history/chrome_history_client.h
diff --git a/chrome/browser/history/chrome_history_client.h b/chrome/browser/history/chrome_history_client.h
index e0482d7a388413e5fda4ff479c80af21eed00965..3e16a6f6398fec59571475b9bde4f7512f6d946a 100644
--- a/chrome/browser/history/chrome_history_client.h
+++ b/chrome/browser/history/chrome_history_client.h
@@ -6,8 +6,8 @@
 #define CHROME_BROWSER_HISTORY_CHROME_HISTORY_CLIENT_H_
 
 #include "base/macros.h"
+#include "chrome/browser/history/history_service.h"
 #include "components/history/core/browser/history_client.h"
-#include "components/history/core/browser/history_service_observer.h"
 #include "components/history/core/browser/top_sites_observer.h"
 
 class BookmarkModel;
@@ -21,8 +21,8 @@ class TopSites;
 // This class implements history::HistoryClient to abstract operations that
 // depend on Chrome environment.
 class ChromeHistoryClient : public history::HistoryClient,
-                            public history::HistoryServiceObserver,
-                            public history::TopSitesObserver {
+                            public history::TopSitesObserver,
+                            public HistoryService::Observer {
  public:
   explicit ChromeHistoryClient(BookmarkModel* bookmark_model,
                                Profile* profile,
@@ -45,7 +45,7 @@ class ChromeHistoryClient : public history::HistoryClient,
   // KeyedService:
   virtual void Shutdown() OVERRIDE;
 
-  // HistoryServiceObserver:
+  // HistoryService::Observer:
   virtual void OnURLVisited(ui::PageTransition transition,
                             const history::URLRow& row,
                             const history::RedirectList& redirects,