Fix find box bug after navigation.

third_party/WebKit/Source/web/TextFinder.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 182 matching lines @@
 
             if (m_activeMatchIndex + 1 > m_lastMatchCount)
                 m_activeMatchIndex = 0;
             else if (m_activeMatchIndex < 0)
                 m_activeMatchIndex = m_lastMatchCount - 1;
         }
         WebRect selectionRect = ownerFrame().frameView()->contentsToRootFrame(m_activeMatch->boundingBox());
         reportFindInPageSelection(selectionRect, m_activeMatchIndex + 1, identifier);
     }
 
+    m_lastFindRequestCompletedWithNoMatches = false;
     return true;
 }
 
 void TextFinder::clearActiveFindMatch()
 {
     m_currentActiveMatchFrame = false;
     setMarkerActive(m_activeMatch.get(), false);
 }
 
 void TextFinder::stopFindingAndClearSelection()
@@ skipping 526 matching lines @@
 DEFINE_TRACE(TextFinder)
 {
     visitor->trace(m_ownerFrame);
     visitor->trace(m_activeMatch);
     visitor->trace(m_resumeScopingFromRange);
     visitor->trace(m_deferredScopingWork);
     visitor->trace(m_findMatchesCache);
 }
 
 } // namespace blink