Rename gobuild.gni to go_test.gni

Change-Id: I7f3fde0b84baacde612c43b44ef35d4c95aa64a0
diff --git a/BUILD.gn b/BUILD.gn
index 3ba979e..509fc10 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/gobuild.gni")
+import("//build/go/go_test.gni")
 
 # The go_runtime action wraps go_toolchain, rebuilding just the standard
 # if it has changed.
@@ -73,7 +73,7 @@
   depth = 1
 }
 
-gotest("go_os_test") {
+go_test("go_os_test") {
   gopackage = "os"
 }