remove irrelevant js string concat tests

These tests were added, pre-fork, in r35454 as part of a fix to JSC which appears related to missing an overflow condition.

Yang is trying to land https://code.google.com/p/v8/source/detail?r=17490 in v8 which furthers the goal of V8 stability by handlfying runtime paths. The V8 patch changes the behavior in the case of OOM for string concat. Whereas before V8 would unwind the stack and report an OOM to chromium, it will now crash (as with many other OOM conditions).

IOW, this test happened to preventing regression for something entirely different in JSC than in V8 -- which was that this code path unwinds the stack rather than crashing with a V8_FATAL_OOM -- thus, just remove the irrelevant test.

Review URL: https://codereview.chromium.org/60273003

git-svn-id: svn://svn.chromium.org/blink/trunk@161375 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move MediaConstraints to platform/

BUG=297477

Review URL: https://codereview.chromium.org/60303002

git-svn-id: svn://svn.chromium.org/blink/trunk@161376 bbb929c8-8fbe-4397-9dbb-9b2b20218538