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This finishes the work in bug 625353 to make
v8_target_cpu/v8_current_cpu work correctly across multiple
toolchains, by deleting the workaround that was needed to
get the changes to land across repos.

TBR=machenbach@chromium.org
BUG=625353

Review-Url: https://codereview.chromium.org/2157733002
Cr-Commit-Position: refs/heads/master@{#405933}