Use javac.jar instead of turbine.jar for window_extensions stub

This input_jars_paths entry flows into bytecode_rewriter classpaths.
Rewriters that resolve types via reflection (loadClass / Class.forName)
require the JVM to link the class, which fails on header-only turbine
output with ClassFormatError: Absent Code attribute. Switch to the
same target's javac.jar, which is linkable. The target is an SDK stub
with placeholder method bodies, so behavior is unchanged.

Change-Id: I1756083b912506dd43b3565fa2e94d9f833159be
Bug: 507092128
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7802498
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Commit-Queue: KE YU <kyu@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1625942}
NOKEYCHECK=True
GitOrigin-RevId: 127b6bb2969e6a49acfe761a9ad6d44c98ed2576