Remove varargs from Fixture(t *testing.T)

Bug: 182885307
Test: m nothing
Change-Id: I71c3cf47ba1dc8d29d1533789c4c991cb825bd88
diff --git a/android/fixture_test.go b/android/fixture_test.go
index 681a034..8f04715 100644
--- a/android/fixture_test.go
+++ b/android/fixture_test.go
@@ -43,43 +43,40 @@
 
 	extension := group.Extend(preparer4, preparer2)
 
-	extension.Fixture(t, preparer1, preparer2, preparer2Then1, preparer3)
+	GroupFixturePreparers(extension, preparer1, preparer2, preparer2Then1, preparer3).Fixture(t)
 
 	AssertDeepEquals(t, "preparers called in wrong order",
 		[]string{"preparer1", "preparer2", "preparer4", "preparer3"}, list)
 }
 
 func TestFixtureValidateMockFS(t *testing.T) {
-	buildDir := "<unused>"
-	factory := NewFixtureFactory(&buildDir)
-
 	t.Run("absolute path", func(t *testing.T) {
 		AssertPanicMessageContains(t, "source path validation failed", "Path is outside directory: /abs/path/Android.bp", func() {
-			factory.Fixture(t, FixtureAddFile("/abs/path/Android.bp", nil))
+			FixtureAddFile("/abs/path/Android.bp", nil).Fixture(t)
 		})
 	})
 	t.Run("not canonical", func(t *testing.T) {
 		AssertPanicMessageContains(t, "source path validation failed", `path "path/with/../in/it/Android.bp" is not a canonical path, use "path/in/it/Android.bp" instead`, func() {
-			factory.Fixture(t, FixtureAddFile("path/with/../in/it/Android.bp", nil))
+			FixtureAddFile("path/with/../in/it/Android.bp", nil).Fixture(t)
 		})
 	})
 	t.Run("FixtureAddFile", func(t *testing.T) {
 		AssertPanicMessageContains(t, "source path validation failed", `cannot add output path "out/Android.bp" to the mock file system`, func() {
-			factory.Fixture(t, FixtureAddFile("out/Android.bp", nil))
+			FixtureAddFile("out/Android.bp", nil).Fixture(t)
 		})
 	})
 	t.Run("FixtureMergeMockFs", func(t *testing.T) {
 		AssertPanicMessageContains(t, "source path validation failed", `cannot add output path "out/Android.bp" to the mock file system`, func() {
-			factory.Fixture(t, FixtureMergeMockFs(MockFS{
+			FixtureMergeMockFs(MockFS{
 				"out/Android.bp": nil,
-			}))
+			}).Fixture(t)
 		})
 	})
 	t.Run("FixtureModifyMockFS", func(t *testing.T) {
 		AssertPanicMessageContains(t, "source path validation failed", `cannot add output path "out/Android.bp" to the mock file system`, func() {
-			factory.Fixture(t, FixtureModifyMockFS(func(fs MockFS) {
+			FixtureModifyMockFS(func(fs MockFS) {
 				fs["out/Android.bp"] = nil
-			}))
+			}).Fixture(t)
 		})
 	})
 }