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The existing target is a static_library, which generated libpdf.a, and
libpdf.a has to be linked into the chrome target. With a component
target, it generates libpdf.so, and the chrome target does not need to
change. This makes rebuilding the chrome target much faster in component
builds.

Change-Id: I0a6f2fde66c7a3a2e46968b5ff387de8e73a5eb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2293325
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789768}