Remove javaFixtureFactory

Replaces uses of javaFixtureFactory with prepareForJavaTest and removes
the unused javaFixtureFactory.

Bug: 182885307
Test: m nothing
Change-Id: I809772d14af2af211b9e15ad676fbdc06b07cd46
diff --git a/java/sdk_test.go b/java/sdk_test.go
index ff0a203..028c4fe 100644
--- a/java/sdk_test.go
+++ b/java/sdk_test.go
@@ -349,7 +349,8 @@
 				android.AssertPathsRelativeToTopEquals(t, "implicits", deps, javac.Implicits)
 			}
 
-			fixtureFactory := javaFixtureFactory.Extend(
+			fixtureFactory := android.GroupFixturePreparers(
+				prepareForJavaTest,
 				FixtureWithPrebuiltApis(map[string][]string{
 					"29":      {},
 					"30":      {},