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A completely unused object file in a static library will be
ignored by the linker, but with jumbo builds unused cc files will
be grouped with used cc files and the object file will no longer
be ignored.

If the cc file contains code that is bad it can then trigger followup
linker errors which happened in this case where debug component
windows builds had too many constructors and destructors for
WebAssociatedURLLoader when building webkit_unit_tests.exe

Change-Id: I16a0332b9e16903481c2995f2176e59a1ba8e53e
Reviewed-on: https://chromium-review.googlesource.com/955850Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#542843}