Change setVertexBuffers to setVertexBuffer

Following WebGPU spec change at
https://github.com/gpuweb/gpuweb/pull/468, this CL changes all
occurrences of setVertexBuffers to setVertexBuffer.

Bug: dawn:22
Change-Id: I48b551a89dc0934dfa61e661e9546a2b7eafd2fc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12020
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Austin Eng <enga@chromium.org>
diff --git a/examples/CppHelloTriangle.cpp b/examples/CppHelloTriangle.cpp
index c9331c1..0fd317c 100644
--- a/examples/CppHelloTriangle.cpp
+++ b/examples/CppHelloTriangle.cpp
@@ -156,13 +156,12 @@
     dawn::Texture backbuffer = swapchain.GetNextTexture();
     utils::ComboRenderPassDescriptor renderPass({backbuffer.CreateView()}, depthStencilView);
 
-    static const uint64_t vertexBufferOffsets[1] = {0};
     dawn::CommandEncoder encoder = device.CreateCommandEncoder();
     {
         dawn::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass);
         pass.SetPipeline(pipeline);
         pass.SetBindGroup(0, bindGroup);
-        pass.SetVertexBuffers(0, 1, &vertexBuffer, vertexBufferOffsets);
+        pass.SetVertexBuffer(0, vertexBuffer);
         pass.SetIndexBuffer(indexBuffer, 0);
         pass.DrawIndexed(3, 1, 0, 0, 0);
         pass.EndPass();