Match vertex format in dawn with webgpu

BUG=dawn:41

Change-Id: If16e615ccf6b9c7e85d41adcdb6d66baa07179da
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/5280
Commit-Queue: Shaobo Yan <shaobo.yan@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/examples/CppHelloTriangle.cpp b/examples/CppHelloTriangle.cpp
index a55e99d..d431db2 100644
--- a/examples/CppHelloTriangle.cpp
+++ b/examples/CppHelloTriangle.cpp
@@ -115,7 +115,7 @@
     attribute.shaderLocation = 0;
     attribute.inputSlot = 0;
     attribute.offset = 0;
-    attribute.format = dawn::VertexFormat::FloatR32G32B32A32;
+    attribute.format = dawn::VertexFormat::Float4;
 
     dawn::VertexInputDescriptor input;
     input.inputSlot = 0;