DevTools: [CodeMirror] roll codemirror to v4.4.1

DevTools: [CodeMirror] roll codemirror to v4.4.1

This rolls codemirror to 2b30a049fd, which is slightly
later than 4.4.1.

Layout test change: In codemirror version 4.4.1 the viewport update logic has changed and it no longer works if text editor offsetHeight is 0px. So creation of editor instance
for tests now setups default editor height of 100px.

R=apavlov
BUG=404120
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180419

[lushnikov, 2014-08-15 13:42:40]

ptal

[apavlov, 2014-08-15 13:45:22]

lgtm

[apavlov, 2014-08-15 13:45:31]

The CQ bit was checked by apavlov@chromium.org

[commit-bot: I haz the power, 2014-08-15 13:45:58]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/lushnikov@chromium.org/475393002/1

[commit-bot: I haz the power, 2014-08-15 15:08:07]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/2...)
  linux_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/2...)
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/19975)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/22945)

[commit-bot: I haz the power, 2014-08-15 15:36:22]

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

[commit-bot: I haz the power, 2014-08-15 15:36:24]

Try jobs failed on following builders:
  linux_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/2...)

[lushnikov, 2014-08-17 11:06:08]

The CQ bit was checked by lushnikov@chromium.org

[commit-bot: I haz the power, 2014-08-17 11:06:52]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/lushnikov@chromium.org/475393002/20001

[commit-bot: I haz the power, 2014-08-17 12:04:06]

Committed patchset #2 (20001) as 180419