Removing useless Win7 checks + standardize its use

media/gpu/gpu_video_decode_accelerator_factory.cc

Index: media/gpu/gpu_video_decode_accelerator_factory.cc
diff --git a/media/gpu/gpu_video_decode_accelerator_factory.cc b/media/gpu/gpu_video_decode_accelerator_factory.cc
index 6b809fd81c84303788208960365b50111cedba0b..e926ad640fc547597f8ac42f69ea8efb4a1fe64e 100644
--- a/media/gpu/gpu_video_decode_accelerator_factory.cc
+++ b/media/gpu/gpu_video_decode_accelerator_factory.cc
@@ -182,12 +182,10 @@ 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