Move blink::PluginData, blink::PluginInfo, blink::MimeTypeInfo to oilpan heap.

third_party/WebKit/Source/modules/plugins/DOMMimeType.h

 /*
     Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 21 matching lines @@
 class DOMPlugin;
 class LocalFrame;
 
 class DOMMimeType final : public GarbageCollectedFinalized<DOMMimeType>,
                           public ScriptWrappable,
                           public ContextClient {
   USING_GARBAGE_COLLECTED_MIXIN(DOMMimeType);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
-  static DOMMimeType* Create(PassRefPtr<PluginData> plugin_data,
-                             LocalFrame* frame,
-                             unsigned index) {
-    return new DOMMimeType(std::move(plugin_data), frame, index);
+  static DOMMimeType* Create(LocalFrame* frame,
+                             const MimeClassInfo* mime_class_info) {

[tkent, 2017/05/25 00:10:31]

Make the argument "const MimeClassInfo&" to ensure it can't be nullptr.

[lfg, 2017/05/25 01:42:40]

Done.

+    return new DOMMimeType(frame, mime_class_info);
   }
   virtual ~DOMMimeType();
 
   const String& type() const;
   String suffixes() const;
   const String& description() const;
   DOMPlugin* enabledPlugin() const;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
-  DOMMimeType(PassRefPtr<PluginData>, LocalFrame*, unsigned index);
+  explicit DOMMimeType(LocalFrame*, const MimeClassInfo*);

[tkent, 2017/05/25 00:10:32]

Do not add |explicit|.
Make the second argument |const MimeClassInfo&|.

[lfg, 2017/05/25 01:42:40]

Done.

 
-  const MimeClassInfo& GetMimeClassInfo() const {
-    return plugin_data_->Mimes()[index_];
-  }
-
-  RefPtr<PluginData> plugin_data_;
-  unsigned index_;
+  Member<const MimeClassInfo> mime_class_info_;
 };
 
 }  // namespace blink
 
 #endif  // DOMMimeType_h