Initialize all ImageCandidate's member variables

Source/core/html/parser/HTMLSrcsetParser.h

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2013 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.
@@ skipping 56 matching lines @@
 
 class ImageCandidate {
 public:
     enum OriginAttribute {
         SrcsetOrigin,
         SrcOrigin
     };
 
     ImageCandidate()
         : m_density(1.0)
+        , m_resourceWidth(UninitializedDescriptor)
+        , m_originAttribute(SrcsetOrigin)
     {
     }
 
     ImageCandidate(const String& source, unsigned start, unsigned length, const DescriptorParsingResult& result, OriginAttribute originAttribute)
         : m_string(source.createView(start, length))
         , m_density(result.hasDensity()?result.density():UninitializedDescriptor)
         , m_resourceWidth(result.hasWidth()?result.resourceWidth():UninitializedDescriptor)
         , m_originAttribute(originAttribute)
     {
     }
@@ skipping 42 matching lines @@
 
 ImageCandidate bestFitSourceForSrcsetAttribute(float deviceScaleFactor, unsigned sourceSize, const String& srcsetAttribute);
 
 ImageCandidate bestFitSourceForImageAttributes(float deviceScaleFactor, unsigned sourceSize, const String& srcAttribute, const String& srcsetAttribute);
 
 String bestFitSourceForImageAttributes(float deviceScaleFactor, unsigned sourceSize, const String& srcAttribute, ImageCandidate& srcsetImageCandidate);
 
 }
 
 #endif