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This CL links libsanitizer_options into every executable built with ASan on OSX.
The existing implementation of __asan_default_options for Chromium.app is merged
with that in sanitizer_options.cc

Also now use_sanitizer_options is only set when building with sanitizers so that
there isn't an unconditional dependency on an empty object file in every
executable in non-sanitizer builds.

In addition to that, the dependency on sanitizers.gyp:sanitizer_options is removed
from ui/base/ui_base_tests.gyp:ui_base_tests_bundle which is not a real shared lib,
despite marked as such.

BUG=302040
TBR=earthdok@chromium.org,cpu@chromium.org
R=avi@chromium.org

Review URL: https://codereview.chromium.org/594843002

Cr-Commit-Position: refs/heads/master@{#296200}