Removed usage of RefPtr::Release in unit tests

third_party/WebKit/Source/platform/graphics/gpu/DrawingBufferTestHelpers.h

 // 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 "gpu/command_buffer/common/capabilities.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/CanvasColorParams.h"
 #include "platform/graphics/gpu/DrawingBuffer.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
@@ skipping 367 matching lines @@
         Extensions3DUtil::Create(context_provider->ContextGL());
     RefPtr<DrawingBufferForTests> drawing_buffer =
         AdoptRef(new DrawingBufferForTests(std::move(context_provider),
                                            std::move(extensions_util), client,
                                            preserve));
     if (!drawing_buffer->Initialize(
             size, use_multisampling != kDisableMultisampling)) {
       drawing_buffer->BeginDestruction();
       return nullptr;
     }
-    return drawing_buffer.Release();
+    return drawing_buffer;
   }
 
   DrawingBufferForTests(
       std::unique_ptr<WebGraphicsContext3DProvider> context_provider,
       std::unique_ptr<Extensions3DUtil> extensions_util,
       DrawingBuffer::Client* client,
       PreserveDrawingBuffer preserve)
       : DrawingBuffer(
             std::move(context_provider),
             std::move(extensions_util),
@@ skipping 17 matching lines @@
   GLES2InterfaceForTests* ContextGLForTests() {
     return static_cast<GLES2InterfaceForTests*>(ContextGL());
   }
 
   bool* live_;
 
   int RecycledBitmapCount() { return recycled_bitmaps_.size(); }
 };
 
 }  // blink