Rename SetRenderPipeline and SetComputePipeline to SetPipeline

To match the WebGPU idl, SetRenderPipeline and SetComputePipeline need to change
the name to SetPipeline.

This patch just rename these two APIs

BUG=dawn:52

Change-Id: I2545c94158ebd051027a018650bf760a25845d73
Reviewed-on: https://dawn-review.googlesource.com/c/3480
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Shaobo Yan <shaobo.yan@intel.com>
diff --git a/examples/CppHelloTriangle.cpp b/examples/CppHelloTriangle.cpp
index 9c2cb20..81cbea8 100644
--- a/examples/CppHelloTriangle.cpp
+++ b/examples/CppHelloTriangle.cpp
@@ -160,7 +160,7 @@
     dawn::CommandBufferBuilder builder = device.CreateCommandBufferBuilder();
     {
         dawn::RenderPassEncoder pass = builder.BeginRenderPass(renderPass);
-        pass.SetRenderPipeline(pipeline);
+        pass.SetPipeline(pipeline);
         pass.SetBindGroup(0, bindGroup);
         pass.SetVertexBuffers(0, 1, &vertexBuffer, vertexBufferOffsets);
         pass.SetIndexBuffer(indexBuffer, 0);