Fix a crash in MimeHandlerServiceImpl::AbortStream().

extensions/browser/api/mime_handler_private/mime_handler_private.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_API_MIME_HANDLER_PRIVATE_MIME_HANDLER_PRIVATE_H_
 #define EXTENSIONS_BROWSER_API_MIME_HANDLER_PRIVATE_MIME_HANDLER_PRIVATE_H_
 
 #include "base/memory/weak_ptr.h"
 #include "extensions/common/api/mime_handler.mojom.h"
 
 namespace extensions {
 class StreamContainer;
+class MimeHandlerServiceImplTest;
 
 class MimeHandlerServiceImpl
     : public mojo::InterfaceImpl<mime_handler::MimeHandlerService> {
  public:
   static void Create(
       base::WeakPtr<StreamContainer> stream_container,
       mojo::InterfaceRequest<mime_handler::MimeHandlerService> request);
 
  private:
+  friend class MimeHandlerServiceImplTest;
+
   explicit MimeHandlerServiceImpl(
       base::WeakPtr<StreamContainer> stream_container);
   ~MimeHandlerServiceImpl() override;
 
   // mime_handler::MimeHandlerService overrides.
   void GetStreamInfo(const mojo::Callback<void(mime_handler::StreamInfoPtr)>&
                          callback) override;
   void AbortStream(const mojo::Callback<void()>& callback) override;
 
   // Invoked by the callback used to abort |stream_|.
@@ skipping 12 matching lines @@
 template <>
 struct TypeConverter<extensions::mime_handler::StreamInfoPtr,
                      extensions::StreamContainer> {
   static extensions::mime_handler::StreamInfoPtr Convert(
       const extensions::StreamContainer& stream);
 };
 
 }  // namespace mojo
 
 #endif  // EXTENSIONS_BROWSER_API_MIME_HANDLER_PRIVATE_MIME_HANDLER_PRIVATE_H_