Add needed virtual destructors.

src/ports/SkFontMgr_win_dw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDWrite.h"
 #include "SkDWriteFontFileStream.h"
 #include "SkFontMgr.h"
@@ skipping 28 matching lines @@
         if (NULL == streamFontFileLoader) {
             return E_OUTOFMEMORY;
         }
         return S_OK;
     }
 
     SkAutoTUnref<SkStream> fStream;
 
 private:
     StreamFontFileLoader(SkStream* stream) : fRefCount(1), fStream(SkRef(stream)) { }
+    virtual ~StreamFontFileLoader() { }
 
     ULONG fRefCount;
 };
 
 HRESULT StreamFontFileLoader::QueryInterface(REFIID iid, void** ppvObject) {
     if (iid == IID_IUnknown || iid == __uuidof(IDWriteFontFileLoader)) {
         *ppvObject = this;
         AddRef();
         return S_OK;
     } else {
@@ skipping 41 matching lines @@
     static HRESULT Create(IDWriteFactory* factory, IDWriteFontFileLoader* fontFileLoader,
                           StreamFontFileEnumerator** streamFontFileEnumerator) {
         *streamFontFileEnumerator = new StreamFontFileEnumerator(factory, fontFileLoader);
         if (NULL == streamFontFileEnumerator) {
             return E_OUTOFMEMORY;
         }
         return S_OK;
     }
 private:
     StreamFontFileEnumerator(IDWriteFactory* factory, IDWriteFontFileLoader* fontFileLoader);
+    virtual ~StreamFontFileEnumerator() { }
+
     ULONG fRefCount;
 
     SkTScopedComPtr<IDWriteFactory> fFactory;
     SkTScopedComPtr<IDWriteFontFile> fCurrentFile;
     SkTScopedComPtr<IDWriteFontFileLoader> fFontFileLoader;
     bool fHasNext;
 };
 
 StreamFontFileEnumerator::StreamFontFileEnumerator(IDWriteFactory* factory,
                                                    IDWriteFontFileLoader* fontFileLoader)
@@ skipping 78 matching lines @@
         if (NULL == streamFontCollectionLoader) {
             return E_OUTOFMEMORY;
         }
         return S_OK;
     }
 private:
     StreamFontCollectionLoader(IDWriteFontFileLoader* fontFileLoader)
         : fRefCount(1)
         , fFontFileLoader(SkRefComPtr(fontFileLoader))
     { }
+    virtual ~StreamFontCollectionLoader() { }
 
     ULONG fRefCount;
     SkTScopedComPtr<IDWriteFontFileLoader> fFontFileLoader;
 };
 
 HRESULT StreamFontCollectionLoader::QueryInterface(REFIID iid, void** ppvObject) {
     if (iid == IID_IUnknown || iid == __uuidof(IDWriteFontCollectionLoader)) {
         *ppvObject = this;
         AddRef();
         return S_OK;
@@ skipping 533 matching lines @@
 }
 
 #include "SkFontMgr_indirect.h"
 SK_API SkFontMgr* SkFontMgr_New_DirectWriteRenderer(SkRemotableFontMgr* proxy) {
     SkAutoTUnref<SkFontMgr> impl(SkFontMgr_New_DirectWrite());
     if (impl.get() == NULL) {
         return NULL;
     }
     return SkNEW_ARGS(SkFontMgr_Indirect, (impl.get(), proxy));
 }