Revert of Implement software fallback for PPB_VideoDecoder.

gpu/command_buffer/common/cmd_buffer_common.cc

Index: gpu/command_buffer/common/cmd_buffer_common.cc
diff --git a/gpu/command_buffer/common/cmd_buffer_common.cc b/gpu/command_buffer/common/cmd_buffer_common.cc
index f337e86dbf735548b0fab88033a43383d4c7f15a..80a1e16dc3cf0f383fd89c0f383a54d7cf310506 100644
--- a/gpu/command_buffer/common/cmd_buffer_common.cc
+++ b/gpu/command_buffer/common/cmd_buffer_common.cc
@@ -31,7 +31,6 @@
 
 }  // namespace cmd
 
-#if !defined(NACL_WIN64)
 // TODO(apatrick): this is a temporary optimization while skia is calling
 // RendererGLContext::MakeCurrent prior to every GL call. It saves returning 6
 // ints redundantly when only the error is needed for the CommandBufferProxy
@@ -39,7 +38,6 @@
 error::Error CommandBuffer::GetLastError() {
   return GetLastState().error;
 }
-#endif
 
 }  // namespace gpu