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'CFI Linux Full' buildbot is similar to 'CFI Linux', but also enables
bad cast checks, which while are not scheduled to be released
to the official Chrome in the nearest future, provide an important
feedback on the bad casts in Chrome. We also want to track any
regressions, so when we're ready to launch them, no additional
cleanup is required.

Also, enabling cfi_cast checks on a number of bots.

BUG=626794

Review-Url: https://codereview.chromium.org/2164033003
Cr-Commit-Position: refs/heads/master@{#406773}