Get rid of VertexFormatType.

The enum VertexFormatType is redundant with angle::FormatID.  The Vulkan
back end has already eschewed VertexFormatType, this change updates the
D3D back ends.

BUG=angleproject:2531

Change-Id: I67ea2203ca80be828f4c757a37810fe67a279364
Reviewed-on: https://chromium-review.googlesource.com/c/1263899
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Frank Henigman <fjhenigman@chromium.org>
diff --git a/src/libANGLE/renderer/d3d/VertexDataManager.cpp b/src/libANGLE/renderer/d3d/VertexDataManager.cpp
index 7a6d611..888e644 100644
--- a/src/libANGLE/renderer/d3d/VertexDataManager.cpp
+++ b/src/libANGLE/renderer/d3d/VertexDataManager.cpp
@@ -86,10 +86,10 @@
     // TODO(jmadill): add VertexFormatCaps
     BufferFactoryD3D *factory = bufferD3D->getFactory();
 
-    gl::VertexFormatType vertexFormatType = gl::GetVertexFormatType(attrib);
+    angle::FormatID vertexFormatID = gl::GetVertexFormatID(attrib);
 
     // CPU-converted vertex data must be converted (naturally).
-    if ((factory->getVertexConversionType(vertexFormatType) & VERTEX_CONVERT_CPU) != 0)
+    if ((factory->getVertexConversionType(vertexFormatID) & VERTEX_CONVERT_CPU) != 0)
     {
         return false;
     }