Set RequestContextObject for PNaCl pexe fetches, to fix On-Demand update.

Set RequestContextObject for PNaCl pexe fetches, to fix On-Demand update.

Add more checks to test to detect that the resource type of
the URL request is indeed OBJECT.
Would like to get this merged to the M38 branch.

BUG=401755
Committed: https://crrev.com/eeba9846656053be6dc90a6f7bf164e5695b5a22
Cr-Commit-Position: refs/heads/master@{#292470}

[teravest, 2014-08-25 16:36:58]

lgtm

[jvoung (off chromium), 2014-08-26 23:16:05]

Nick can I get an OWNERs review for chrome/test/nacl/pnacl_header_test.{cc,h} ?
Thanks!

[Nick Bray (chromium), 2014-08-28 20:30:51]

LGTM

[jvoung (off chromium), 2014-08-28 20:42:48]

The CQ bit was checked by jvoung@chromium.org

[commit-bot: I haz the power, 2014-08-28 20:43:55]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jvoung@chromium.org/471233003/80001

[commit-bot: I haz the power, 2014-08-28 21:47:07]

Committed patchset #5 (id:80001) as bfc3e122d6721ccc93f0f8b19dac4a3c2a0c947d

[Alpha Left Google, 2014-08-29 00:25:29]

On 2014/08/28 21:47:07, I haz the power (commit-bot) wrote:
> Committed patchset #5 (id:80001) as bfc3e122d6721ccc93f0f8b19dac4a3c2a0c947d

This change is causing failuing on a Blink bot on ChromeOS:

http://build.chromium.org/p/chromium.webkit/builders/Linux%20ChromiumOS%20Tes...

[jvoung (off chromium), 2014-08-29 00:33:10]

A revert of this CL (patchset #5) has been created in
https://codereview.chromium.org/524483002/ by jvoung@chromium.org.

The reason for reverting is: Test is failing on a Blink bot on ChromeOS.

[commit-bot: I haz the power, 2014-09-10 03:02:30]

Patchset 5 (id:??) landed as
https://crrev.com/eeba9846656053be6dc90a6f7bf164e5695b5a22
Cr-Commit-Position: refs/heads/master@{#292470}