Remove tabs and trailing whitspace in LayoutTests/dom/.../*.js

Remove tabs and trailing whitspace in LayoutTests/dom/.../*.js

Command to reproduce:

$ find LayoutTests/dom -name '*.js' | while read f; do sed 's/\t/    /g' < $f | git stripspace > tmp; mv tmp $f; done

R=mkwst@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=186014

[philipj_slow, 2014-11-25 16:56:50]

philipj@opera.com changed reviewers:
+ mkwst@chromium.org

[philipj_slow, 2014-11-25 16:57:11]

PTAL

[Mike West, 2014-11-26 08:07:00]

Spot-checked LGTM, assuming the bots are happy.

Thank you so much!

[philipj_slow, 2014-11-26 08:41:37]

This patch is too big for the bots to apply, so I'm going to run all the tests a
few times locally and dcommit it.

[philipj_slow, 2014-11-26 09:13:16]

rebase

[philipj_slow, 2014-11-26 09:16:32]

Committed patchset #2 (id:10001) manually as 186014 (presubmit successful).