Fix the end time bound in WebHistoryService to match the API

Change the exclusive end time bound in WebHistoryService to be inclusive,
as required by the history.google.com API.

BUG=674165

Review-Url: https://codereview.chromium.org/2621143004
Cr-Commit-Position: refs/heads/master@{#443245}

components/history/core/browser/web_history_service.cc

@@ -275,10 +275,14 @@ GURL GetQueryUrl(const base::string16& text_query,
   url = net::AppendQueryParameter(url, "titles", "1");
 
   // Take |begin_time|, |end_time|, and |max_count| from the original query
-  // options, and convert them to the equivalent URL parameters.
+  // options, and convert them to the equivalent URL parameters. Note that
+  // QueryOptions uses exclusive |end_time| while the history.google.com API
+  // uses it inclusively, so we subtract 1us during conversion.
 
   base::Time end_time =
-      std::min(base::Time::FromInternalValue(options.EffectiveEndTime()),
+      options.end_time.is_null()
+          ? base::Time::Now()
+          : std::min(options.end_time - base::TimeDelta::FromMicroseconds(1),
                      base::Time::Now());
   url = net::AppendQueryParameter(url, "max", ServerTimeString(end_time));