Unify the three places that patch font loading for PDFium on Windows.

content/renderer/render_thread_impl_browsertest.cc

 // Copyright 2013 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 "base/callback.h"
 #include "base/command_line.h"
 #include "base/memory/discardable_memory.h"
 #include "base/memory/scoped_vector.h"
 #include "base/thread_task_runner_handle.h"
 #include "content/common/resource_messages.h"
@@ skipping 59 matching lines @@
     return count_;
   }
 
  private:
   ~TestTaskCounter() override {}
 
   mutable base::Lock lock_;
   int count_;
 };
 
+#if defined(COMPILER_MSVC)
+// See explanation for other RenderViewHostImpl which is the same issue.
+#pragma warning(push)
+#pragma warning(disable: 4250)
+#endif
+
 class RenderThreadImplForTest : public RenderThreadImpl {
  public:
   RenderThreadImplForTest(const std::string& channel_id,
                           scoped_refptr<TestTaskCounter> test_task_counter)
       : RenderThreadImpl(channel_id), test_task_counter_(test_task_counter) {}
 
   ~RenderThreadImplForTest() override {}
 
   void SetResourceDispatchTaskQueue(
       const scoped_refptr<base::SingleThreadTaskRunner>&) override {
     // Use our TestTaskCounter instead.
     RenderThreadImpl::SetResourceDispatchTaskQueue(test_task_counter_);
   }
 
-  using ChildThread::OnMessageReceived;
+  using ChildThreadImpl::OnMessageReceived;
 
  private:
   scoped_refptr<TestTaskCounter> test_task_counter_;
 };
 
+#if defined(COMPILER_MSVC)
+#pragma warning(pop)
+#endif
+
 void QuitTask(base::MessageLoop* message_loop) {
   message_loop->QuitWhenIdle();
 }
 
 class QuitOnTestMsgFilter : public IPC::MessageFilter {
  public:
   explicit QuitOnTestMsgFilter(base::MessageLoop* message_loop)
       : message_loop_(message_loop) {}
 
   // IPC::MessageFilter overrides:
@@ skipping 121 matching lines @@
   test_helper_->Sender()->Send(new WebSocketMsg_NotifyFailure(1, ""));
   test_helper_->Sender()->Send(new TestMsg_QuitRunLoop());
 
   test_helper_->GetMessageLoop()->Run();
 
   EXPECT_EQ(0, test_task_counter_->NumTasksPosted());
 }
 
 }  // namespace
 }  // namespace content