ui/base/dragdrop: Fix warnings found by clang chromium-style plugin on Windows.

ui/base/dragdrop/os_exchange_data_provider_win.h

 // Copyright (c) 2012 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 UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_
 
 #include <objidl.h>
 #include <shlobj.h>
 #include <string>
@@ skipping 86 matching lines @@
   // Removes from contents_ the first data that matches |format|.
   void RemoveData(const FORMATETC& format);
 
   // Our internal representation of stored data & type info.
   struct StoredDataInfo {
     FORMATETC format_etc;
     STGMEDIUM* medium;
     bool owns_medium;
     scoped_refptr<DownloadFileProvider> downloader;
 
-    StoredDataInfo(const FORMATETC& format_etc, STGMEDIUM* medium)
-        : format_etc(format_etc), medium(medium), owns_medium(true) {}
-
-    ~StoredDataInfo() {
-      if (owns_medium) {
-        ReleaseStgMedium(medium);
-        delete medium;
-      }
-      if (downloader.get())
-        downloader->Stop();
-    }
+    StoredDataInfo(const FORMATETC& format_etc, STGMEDIUM* medium);
+    ~StoredDataInfo();
   };
 
   typedef ScopedVector<StoredDataInfo> StoredData;
   StoredData contents_;
 
   base::win::ScopedComPtr<IDataObject> source_object_;
 
   bool is_aborting_;
   bool in_drag_loop_;
   bool in_async_mode_;
@@ skipping 70 matching lines @@
   // Drag image and offset data. Only used for Ash.
   gfx::ImageSkia drag_image_;
   gfx::Vector2d drag_image_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(OSExchangeDataProviderWin);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_