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Previously fidl_library GN template required namespace parameter. It was
separate from library_name mainly to workaround the lack of
string_replace() function in GN. But that's not a problem anymore. This
change updates fidl_library template to make namespace parameter
optional. Now library_name can contain complete name of a FIDL library,
e.g. "fuchsia.ui.gfx". namespace is still supported and works as before.

Also updated all FIDL targets to specify namespace as part of
library_name.

Bug: 1050252
Change-Id: I3de83e244b3ef32449e170f06933beb58198aa0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2045000
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740475}