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Make the metadata machinery on Android use output_extension in
shared_library and similar targets if it is set, so the gathered
metadata matches the actual names of built binaries. GN shared_library
targets can set a custom 'output_extension' (for example, to explicitly
always have a .so extension and never .cr.so) and the Android metadata
machinery should work with that.

Test: set output_extension on a solib and build Android
Bug: 980569
Change-Id: I12fb2b31e753adf81bac86c07e10aa913de51969
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730155
Auto-Submit: Tomasz Śniatowski <tsniatowski@vewd.com>
Commit-Queue: Tomasz Śniatowski <tsniatowski@vewd.com>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683668}