html_viewer: Set expected content length to -1 in ToWebURLResponse().

html_viewer: Set expected content length to -1 in ToWebURLResponse().

Currently ToWebURLResponse() is not setting the expected content length. The
default value from Blink is 0. In Chromium, -1 means "Not available". This CL
sets this value to -1 to be consistent with the Chromium net/ code. See
content/public/common/resource_response_info.h.

BUG=468489
TEST=html_viewer works with streaming servers.

Committed: https://crrev.com/bc1ee8a26a899b13bd19ca2c6e486d37610fc380
Cr-Commit-Position: refs/heads/master@{#321600}

[xhwang, 2015-03-19 18:03:50]

xhwang@chromium.org changed reviewers:
+ jamesr@chromium.org, mpcomplete@chromium.org, rvargas@chromium.org

[xhwang, 2015-03-19 18:03:51]

rvargas / mpcomplete: This might be a hack, but it works for us. Please take a
look. If you have better idea please let me know.

jamesr: Adding you as the OWNER as html_viewer since aa@ is leaving.

[rvargas (doing something else), 2015-03-19 19:07:10]

The change looks fine to me but I'm not the right person to say if this is good
or not (I've never seen any of this code)

[jamesr, 2015-03-19 19:50:19]

lgtm

[xhwang, 2015-03-20 01:00:07]

mpcomplete: kindly ping?

[Matt Perry, 2015-03-20 17:49:46]

lgtm

[Matt Perry, 2015-03-20 17:49:50]

The CQ bit was checked by mpcomplete@chromium.org

[commit-bot: I haz the power, 2015-03-20 17:50:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1013413003/1

[commit-bot: I haz the power, 2015-03-20 18:12:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-20 18:13:16]

Patchset 1 (id:??) landed as
https://crrev.com/bc1ee8a26a899b13bd19ca2c6e486d37610fc380
Cr-Commit-Position: refs/heads/master@{#321600}