hg: jigsaw/jake/langtools: Update Layer API to make it easy to create layers without needing to provide

[alan.bateman at oracle.com]

Changeset: 1def640be25b
Author:    alanb
Date:      2015-12-17 17:00 +0000
URL:       http://hg.openjdk.java.net/jigsaw/jake/langtools/rev/1def640be25b

Update Layer API to make it easy to create layers without needing to provide
class loaders

! src/jdk.compiler/share/classes/com/sun/tools/javac/file/JavacFileManager.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/util/ModuleWrappers.java