[ServiceWorker] Serialize Cache.put() calls in Cache.match tests.

[ServiceWorker] Serialize Cache.put() calls in Cache.match tests.

Also remove extraneous test cache entry.

The result of inserting cache entries that have 'Vary' headers depend on
the order of insertion. Make the test setup step be deterministic so
that the prepopulated cache is always in a predictable state when the
tests are run.

R=jsbell, bkelly@mozilla.com
BUG=428965, 374802, 429874
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=185060

[jsbell, 2014-11-07 20:23:25]

lgtm

Enumeration order of object keys should be deterministic (for web-compat
reasons) so I'd be surprised if the change to an array is actually necessary,
but I think it's more readable this way anyway.

[asanka, 2014-11-10 19:31:54]

On 2014/11/07 20:23:25, jsbell wrote:
> lgtm
> 
> Enumeration order of object keys should be deterministic (for web-compat
> reasons) so I'd be surprised if the change to an array is actually necessary,
> but I think it's more readable this way anyway.

Thanks! You're right that the conversion to an array wasn't necessary. I did so
anyway because the spec doesn't guarantee an ordering for Object.keys().

[asanka, 2014-11-10 19:37:23]

The CQ bit was checked by asanka@chromium.org

[commit-bot: I haz the power, 2014-11-10 19:37:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/705343002/20001

[commit-bot: I haz the power, 2014-11-10 20:42:31]

Committed patchset #2 (id:20001) as 185060