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Rename the "linker_script_copy" target to "android_exports" and move the
link_settings clause to that target. This avoids the linker flag being
duplicated once for every target which includes jni_generator.gypi,
which causes problems on some linker versions.

BUG=402003

Review URL: https://codereview.chromium.org/473173004

Cr-Commit-Position: refs/heads/master@{#289941}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289941 0039d316-1c4b-4281-b951-d872f2087c98