Fixed crash in WebFrameImpl::resetMatchCount function.

Source/web/WebLocalFrameImpl.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 1482 matching lines @@
 void WebLocalFrameImpl::cancelPendingScopingEffort()
 {
     if (m_textFinder)
         m_textFinder->cancelPendingScopingEffort();
 }
 
 void WebLocalFrameImpl::increaseMatchCount(int count, int identifier)
 {
     // This function should only be called on the mainframe.
     ASSERT(!parent());
-    ASSERT(m_textFinder);
-    m_textFinder->increaseMatchCount(identifier, count);
+    ensureTextFinder().increaseMatchCount(identifier, count);
 }
 
 void WebLocalFrameImpl::resetMatchCount()
 {
-    ASSERT(m_textFinder);
-    m_textFinder->resetMatchCount();
+    ensureTextFinder().resetMatchCount();
 }
 
 void WebLocalFrameImpl::sendOrientationChangeEvent(int orientation)
 {
     if (frame())
         frame()->sendOrientationChangeEvent(orientation);
 }
 
 void WebLocalFrameImpl::dispatchMessageEventWithOriginCheck(const WebSecurityOrigin& intendedTargetOrigin, const WebDOMEvent& event)
 {
     ASSERT(!event.isNull());
     frame()->domWindow()->dispatchMessageEventWithOriginCheck(intendedTargetOrigin.get(), event, nullptr);
 }
 
 int WebLocalFrameImpl::findMatchMarkersVersion() const
 {
     ASSERT(!parent());
 
     if (m_textFinder)
         return m_textFinder->findMatchMarkersVersion();
     return 0;
 }
 
 int WebLocalFrameImpl::selectNearestFindMatch(const WebFloatPoint& point, WebRect* selectionRect)
 {
     ASSERT(!parent());
-    ASSERT(m_textFinder);
-    return m_textFinder->selectNearestFindMatch(point, selectionRect);
+    return ensureTextFinder().selectNearestFindMatch(point, selectionRect);
 }
 
 WebFloatRect WebLocalFrameImpl::activeFindMatchRect()
 {
     ASSERT(!parent());
 
     if (m_textFinder)
         return m_textFinder->activeFindMatchRect();
     return WebFloatRect();
 }
 
 void WebLocalFrameImpl::findMatchRects(WebVector<WebFloatRect>& outputRects)
 {
     ASSERT(!parent());
-    ASSERT(m_textFinder);
-    m_textFinder->findMatchRects(outputRects);
+    ensureTextFinder().findMatchRects(outputRects);
 }
 
 void WebLocalFrameImpl::setTickmarks(const WebVector<WebRect>& tickmarks)
 {
     if (frameView()) {
         Vector<IntRect> tickmarksConverted(tickmarks.size());
         for (size_t i = 0; i < tickmarks.size(); ++i)
             tickmarksConverted[i] = tickmarks[i];
         frameView()->setTickmarks(tickmarksConverted);
         invalidateScrollbar();
@@ skipping 415 matching lines @@
 
 void WebLocalFrameImpl::invalidateAll() const
 {
     ASSERT(frame() && frame()->view());
     FrameView* view = frame()->view();
     view->invalidateRect(view->frameRect());
     invalidateScrollbar();
 }
 
 } // namespace blink