Fix PrintingControllerTest#testNormalPrintingFlow and reenable the test

Fix PrintingControllerTest#testNormalPrintingFlow and reenable the test

Moves the creation of PrintingControllerImpl into the UI thread.
Before, it wasn't being created in the UI thread, and for some reason
PrintingControllerImpl#create wasn't failing its UI thread assertion.
It did start to fail for N4 with KitKat, so this fixes the issue and
re-enables the test.

BUG=330291
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=243850

[whywhat, 2014-01-07 15:02:57]

lgtm

[commit-bot: I haz the power, 2014-01-07 15:04:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/cimamoglu@chromium.org/123883002/1

[commit-bot: I haz the power, 2014-01-07 15:23:05]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[cimamoglu (inactive), 2014-01-07 16:39:52]

bulach@chromium.org: Please review changes in 

For OWNERS

[bulach, 2014-01-08 16:04:19]

lgtm, thanks!

[commit-bot: I haz the power, 2014-01-08 16:06:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/cimamoglu@chromium.org/123883002/1

[commit-bot: I haz the power, 2014-01-08 16:29:55]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[commit-bot: I haz the power, 2014-01-08 16:34:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/cimamoglu@chromium.org/123883002/250001

[commit-bot: I haz the power, 2014-01-09 02:43:18]

Retried try job too often on android_clang_dbg for step(s) slave_steps
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android_cl...

[commit-bot: I haz the power, 2014-01-09 11:29:04]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/cimamoglu@chromium.org/123883002/250001

[commit-bot: I haz the power, 2014-01-09 11:51:07]

Change committed as 243850