IndexedDB: Re-enable key-type-array test as FLAKY to check current behavior

This test started failing flakily several months ago; the root cause was
not identified but appeared to be a difficult to repro v8/binding/gc issue.
Unable to repro locally but some extensive work has been done in this
area recently, so we want to enable the test to see if it's still flaking.

BUG=165671

Review URL: https://codereview.chromium.org/12334099

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@184766 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed