Revert^2 "Rename DexJar interface method to DexJarBuildPath."

This reverts commit b0dc851ff4eca650042b52ce4ff06cb7e0312b77.

Reason for revert: relanding original change. Build failures were
  caused by a race with another CL: https://r.android.com/1320920

Test: lunch aosp_cf_x86_phone-userdebug && m
Change-Id: Ic9016582dae7773b4d4f84a63425f1ef7a5d061f
diff --git a/apex/apex.go b/apex/apex.go
index 8fd80fc..b9fc4e1 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -1650,14 +1650,14 @@
 }
 
 type javaDependency interface {
-	DexJar() android.Path
+	DexJarBuildPath() android.Path
 	JacocoReportClassesFile() android.Path
 	Stem() string
 }
 
 func apexFileForJavaLibrary(ctx android.BaseModuleContext, lib javaDependency, module android.Module) apexFile {
 	dirInApex := "javalib"
-	fileToCopy := lib.DexJar()
+	fileToCopy := lib.DexJarBuildPath()
 	af := newApexFile(ctx, fileToCopy, module.Name(), dirInApex, javaSharedLib, module)
 	af.jacocoReportClassesFile = lib.JacocoReportClassesFile()
 	af.stem = lib.Stem() + ".jar"