Removing useless Win7 checks + standardize its use

media/gpu/gpu_video_decode_accelerator_factory.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 "media/gpu/gpu_video_decode_accelerator_factory.h"
 
 #include "base/memory/ptr_util.h"
 #include "gpu/command_buffer/service/gpu_preferences.h"
 #include "media/base/media_switches.h"
 #include "media/gpu/gpu_video_accelerator_util.h"
@@ skipping 164 matching lines @@
                                                   make_context_current_cb_));
   }
   return decoder;
 }
 
 std::unique_ptr<VideoDecodeAccelerator>
 GpuVideoDecodeAcceleratorFactory::CreateDXVAVDA(
     const gpu::GpuDriverBugWorkarounds& workarounds,
     const gpu::GpuPreferences& gpu_preferences) const {
   std::unique_ptr<VideoDecodeAccelerator> decoder;
-  if (base::win::GetVersion() >= base::win::VERSION_WIN7) {
-    DVLOG(0) << "Initializing DXVA HW decoder for windows.";
-    decoder.reset(new DXVAVideoDecodeAccelerator(
-        get_gl_context_cb_, make_context_current_cb_, bind_image_cb_,
-        workarounds, gpu_preferences));
-  }
+  DVLOG(0) << "Initializing DXVA HW decoder for windows.";
+  decoder.reset(new DXVAVideoDecodeAccelerator(
+      get_gl_context_cb_, make_context_current_cb_, bind_image_cb_,
+      workarounds, gpu_preferences));
   return decoder;
 }
 #endif
 
 #if defined(OS_CHROMEOS) && defined(USE_V4L2_CODEC)
 std::unique_ptr<VideoDecodeAccelerator>
 GpuVideoDecodeAcceleratorFactory::CreateV4L2VDA(
     const gpu::GpuDriverBugWorkarounds& workarounds,
     const gpu::GpuPreferences& gpu_preferences) const {
   std::unique_ptr<VideoDecodeAccelerator> decoder;
@@ skipping 68 matching lines @@
     const AndroidOverlayMojoFactoryCB& overlay_factory_cb)
     : get_gl_context_cb_(get_gl_context_cb),
       make_context_current_cb_(make_context_current_cb),
       bind_image_cb_(bind_image_cb),
       get_gles2_decoder_cb_(get_gles2_decoder_cb),
       overlay_factory_cb_(overlay_factory_cb) {}
 
 GpuVideoDecodeAcceleratorFactory::~GpuVideoDecodeAcceleratorFactory() {}
 
 }  // namespace media