Use ChildThreadImpl::thread_safe_sender in font proxy if available

content/child/dwrite_font_proxy/font_fallback_win_unittest.cc

 // Copyright 2016 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.
 
 #include "content/child/dwrite_font_proxy/font_fallback_win.h"
 
 #include <dwrite.h>
 #include <shlobj.h>
 #include <wrl.h>
 
@@ skipping 26 matching lines @@
                            CSIDL_FONTS, FALSE /* fCreate*/);
     base::string16 segoe_path;
     segoe_path.append(font_path.data()).append(L"\\seguisym.ttf");
 
     fake_collection_ = new FakeFontCollection();
     fake_collection_->AddFont(L"Segoe UI Symbol")
         .AddFamilyName(L"en-us", L"Segoe UI Symbol")
         .AddFilePath(segoe_path);
 
     mswr::MakeAndInitialize<DWriteFontCollectionProxy>(
-        &collection_, factory_.Get(), fake_collection_->GetSender());
+        &collection_, factory_.Get(),
+        base::Bind(&FakeFontCollection::GetSender, fake_collection_));
   }
 
   void CreateDWriteFactory(IUnknown** factory) {
     using DWriteCreateFactoryProc = decltype(DWriteCreateFactory)*;
     HMODULE dwrite_dll = LoadLibraryW(L"dwrite.dll");
     if (!dwrite_dll)
       return;
 
     DWriteCreateFactoryProc dwrite_create_factory_proc =
         reinterpret_cast<DWriteCreateFactoryProc>(
@@ skipping 139 matching lines @@
                           DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STYLE_NORMAL,
                           DWRITE_FONT_STRETCH_NORMAL, &mapped_length, &font,
                           &scale);
 
   EXPECT_EQ(1u, fake_collection_->MessageCount());
   EXPECT_EQ(2u, mapped_length);
 }
 
 }  // namespace
 }  // namespace content