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

This reverts commit b0dc851ff4.

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

java/dexpreopt_bootjars.go

@@ -255,7 +255,7 @@ func getBootImageJar(ctx android.SingletonContext, image *bootImageConfig, modul
 		return -1, nil
 	}
 
-	jar, hasJar := module.(interface{ DexJar() android.Path })
+	jar, hasJar := module.(interface{ DexJarBuildPath() android.Path })
 	if !hasJar {
 		return -1, nil
 	}
@@ -296,7 +296,7 @@ func getBootImageJar(ctx android.SingletonContext, image *bootImageConfig, modul
 		panic("unknown boot image: " + image.name)
 	}
 
-	return index, jar.DexJar()
+	return index, jar.DexJarBuildPath()
 }
 
 // buildBootImage takes a bootImageConfig, creates rules to build it, and returns the image.