Rename BuildDir and NinjaBuildDir.

These are just out/ and out/soong/ and the old names were quite
confusing.

Test: Presubmits.
Merged-In: I999ca62162062f27e449f83ffb00fa580d4065b8
Merged-In: I2fcd80a9e376a6842a06aa104a9f6f5c5e16f8c7
Change-Id: Ib481d2aac40df8da1b74174dc8ec576c1cb48be0
diff --git a/android/fixture.go b/android/fixture.go
index fd051a7..728f031 100644
--- a/android/fixture.go
+++ b/android/fixture.go
@@ -834,7 +834,7 @@
 func (r *TestResult) NormalizePathForTesting(path Path) string {
 	pathContext := PathContextForTesting(r.Config)
 	pathAsString := path.String()
-	if rel, isRel := MaybeRel(pathContext, r.Config.BuildDir(), pathAsString); isRel {
+	if rel, isRel := MaybeRel(pathContext, r.Config.SoongOutDir(), pathAsString); isRel {
 		return rel
 	}
 	return pathAsString