Reland "Enable Object.observe by default" again

Reland "Enable Object.observe by default" again

This re-re-re-lands enabling Object.observe. The Chromium tests that
failed last time this was rolled into Chromium have been disabled in
https://src.chromium.org/viewvc/chrome?view=revision&revision=256706

This patch should be safe to merge once that lands.

BUG=v8:2409
LOG=Y
TBR=rossberg@chromium.org,dslomov@chromium.org,rafaelw@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=19868

[adamk, 2014-03-13 00:20:15]

Committed patchset #1 manually as r19868 (presubmit successful).

[Dmitry Lomov (no reviews), 2014-03-13 07:50:56]

Are we positively sure that the failure is tests-only?

[adamk, 2014-03-13 15:54:19]

On 2014/03/13 07:50:56, Dmitry Lomov (chromium) wrote:
> Are we positively sure that the failure is tests-only?

No, I am not positively sure. Per my comments on the bug, the thing I'm sure
about is that the Chromium test (and/or feature) is breaking due to a dependency
on Polymer, and that dependency isn't something we can let hold up rolling
forward with web features that Polymer itself depends upon (otherwise we'll be
stuck in a Catch-22).