Fix find box bug after navigation.

content/browser/find_request_manager_browsertest.cc

 // Copyright 2016 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 "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/content_browser_test.h"
@@ skipping 535 matching lines @@
   // across the frame boundary should not cause the frame to be re-scoped. If
   // the re-scope occurs, then we will see the number of matches change in one
   // of the recorded find replies.
   for (auto& reply : delegate()->GetReplyRecord()) {
     EXPECT_EQ(last_request_id(), reply.request_id);
     EXPECT_TRUE(reply.number_of_matches == kInvalidId ||
                 reply.number_of_matches == results.number_of_matches);
   }
 }
 
+IN_PROC_BROWSER_TEST_F(FindRequestManagerTest, MAYBE(FindInPage_Issue644448)) {
+  TestNavigationObserver navigation_observer(contents());
+  NavigateToURL(shell(), GURL("about:blank"));
+  EXPECT_TRUE(navigation_observer.last_navigation_succeeded());
+
+  blink::WebFindOptions default_options;
+  Find("result", default_options);
+  delegate()->WaitForFinalReply();
+
+  // Initially, there are no matches on the page.
+  FindResults results = delegate()->GetFindResults();
+  EXPECT_EQ(last_request_id(), results.request_id);
+  EXPECT_EQ(0, results.number_of_matches);
+  EXPECT_EQ(0, results.active_match_ordinal);
+
+  // Load a page with matches.
+  LoadAndWait("/find_in_simple_page.html");
+
+  Find("result", default_options);
+  delegate()->WaitForFinalReply();
+
+  // There should now be matches found. When the bug was present, there were
+  // still no matches found.
+  results = delegate()->GetFindResults();
+  EXPECT_EQ(last_request_id(), results.request_id);
+  EXPECT_EQ(5, results.number_of_matches);
+  EXPECT_EQ(1, results.active_match_ordinal);
+}
+
 #if defined(OS_ANDROID)
 // Tests requesting find match rects.
 IN_PROC_BROWSER_TEST_F(FindRequestManagerTest, MAYBE(FindMatchRects)) {
   LoadAndWait("/find_in_page.html");
 
   blink::WebFindOptions default_options;
   Find("result", default_options);
   delegate()->WaitForFinalReply();
   EXPECT_EQ(19, delegate()->GetFindResults().number_of_matches);
 
@@ skipping 93 matching lines @@
     delegate()->MarkNextReply();
     contents()->ActivateNearestFindResult(
         rects[order[i]].CenterPoint().x(), rects[order[i]].CenterPoint().y());
     delegate()->WaitForNextReply();
     EXPECT_EQ(order[i] + 1, delegate()->GetFindResults().active_match_ordinal);
   }
 }
 #endif  // defined(OS_ANDROID)
 
 }  // namespace content