[Offline Pages] Adding missing image/CSS detection in FrameSerializer.

third_party/WebKit/Source/web/tests/WebFrameSerializerSanitizationTest.cpp

 /*
  * Copyright (C) 2011 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 52 matching lines @@
   bool ShouldSkipResource(const WebURL&) final { return false; }
 
   WebString GetContentID(WebFrame*) final { return WebString("<cid>"); }
 
   WebFrameSerializerCacheControlPolicy CacheControlPolicy() final {
     return WebFrameSerializerCacheControlPolicy::kNone;
   }
 
   bool UseBinaryEncoding() final { return false; }
   bool RemovePopupOverlay() final { return remove_popup_overlay_; }
+  bool UsePageProblemDetectors() final { return false; }
 
   bool remove_popup_overlay_;
 };
 
 // Returns the count of match for substring |pattern| in string |str|.
 int MatchSubstring(const String& str, const char* pattern, size_t size) {
   int matches = 0;
   size_t start = 0;
   while (true) {
     size_t pos = str.Find(pattern, start);
@@ skipping 257 matching lines @@
             mhtml.Find("<meta http-equiv=3D\"Content-Security-Policy"));
   EXPECT_NE(WTF::kNotFound, mhtml.Find("<meta name=3D\"description"));
   EXPECT_NE(WTF::kNotFound, mhtml.Find("<meta http-equiv=3D\"refresh"));
 
   // If an element is removed, its children should also be skipped.
   EXPECT_EQ(WTF::kNotFound, mhtml.Find("<select"));
   EXPECT_EQ(WTF::kNotFound, mhtml.Find("<option"));
 }
 
 }  // namespace blink