Add an infrastructure to query history.google.com about other forms of browsing history.

components/history/core/browser/web_history_service.cc

Index: components/history/core/browser/web_history_service.cc
diff --git a/components/history/core/browser/web_history_service.cc b/components/history/core/browser/web_history_service.cc
index 392db72edcd7778a52fc26c8d930e65e61e05a91..b46f6fbac5817cc61d481a17efbcb3fe7c9b5267 100644
--- a/components/history/core/browser/web_history_service.cc
+++ b/components/history/core/browser/web_history_service.cc
@@ -437,6 +437,12 @@ size_t WebHistoryService::GetNumberOfPendingAudioHistoryRequests() {
   return pending_audio_history_requests_.size();
 }
 
+bool WebHistoryService::HasOtherFormsOfBrowsingHistory() const {
+  // TODO(msramek): Query history.google.com for existence of other forms of
+  // browsing history. In the meantime, assume that there isn't.
+  return false;
+}
+
 // static
 void WebHistoryService::QueryHistoryCompletionCallback(
     const WebHistoryService::QueryWebHistoryCallback& callback,