Fix EGL_D3D_TEXTURE_SUBRESOURCE_ID_ANGLE enum typo in extension spec.

BUG=angleproject:1332

Change-Id: I2c5aa9e155f175fea51af05fed40a55569e6745a
Reviewed-on: https://chromium-review.googlesource.com/408813
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>

extensions/EGL_ANGLE_stream_producer_d3d_texture_nv12.txt

@@ -59,7 +59,7 @@ New Tokens
 
     Accepted as an <attribute> in eglStreamPostD3DTextureNV12ANGLE:
 
-        EGL_D3D_TEXTURE_SUBRESOURCE_ID_ANGLE 0x3AAB
+        EGL_D3D_TEXTURE_SUBRESOURCE_ID_ANGLE 0x33AB
 
 Replace section "3.10.3.1 No way to connect producer to EGLStream" in the
 EGL_KHR_stream extension with this: