Don't call Chrome::print() if there is a provisional DocumentLoader

Don't call Chrome::print() if there is a provisional DocumentLoader

In this case, the frame isn't done loading, and we may attempt to print something bogus.

BUG=339075
TEST=Manually, on a google presentation with --enable-print-preview

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169509

[Nate Chapin, 2014-03-18 17:54:36]

I don't have a good idea for how to write a test for this.

[abarth-chromium, 2014-03-18 22:49:48]

It's kind of lame not to have a test, but ok.  LGTM

[Nate Chapin, 2014-03-18 22:52:32]

On 2014/03/18 22:49:48, abarth wrote:
> It's kind of lame not to have a test, but ok.  LGTM

Agreed. If I'm missing something obvious to test this, let me know.

[Nate Chapin, 2014-03-18 22:52:40]

The CQ bit was checked by japhet@chromium.org

[commit-bot: I haz the power, 2014-03-18 22:52:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/japhet@chromium.org/196833005/20001

[commit-bot: I haz the power, 2014-03-18 22:57:22]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-03-18 22:57:24]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[Nate Chapin, 2014-03-18 23:00:25]

The CQ bit was checked by japhet@chromium.org

[commit-bot: I haz the power, 2014-03-18 23:00:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/japhet@chromium.org/196833005/20001

[commit-bot: I haz the power, 2014-03-18 23:21:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-03-18 23:21:06]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[Nate Chapin, 2014-03-18 23:22:37]

The CQ bit was checked by japhet@chromium.org

[commit-bot: I haz the power, 2014-03-18 23:22:42]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/japhet@chromium.org/196833005/20001

[commit-bot: I haz the power, 2014-03-19 02:52:17]

Change committed as 169509