Revert of Turn on icu_use_data_file_flag on CrOS (https://codereview.chromium.org/163793004/)

Reason for revert:
https://chromium-review.googlesource.com/#/c/185937/ has to go in first. 


Original issue's description:
> Turn on icu_use_data_file_flag on CrOS
> 
> See also https://chromium-review.googlesource.com/#/c/185937/
> 
> The switch has to be turned on in two places (chromeos-chrome.ebuild and
> build/common.gypi). One or the other can get landed separately, though.
> 
> BUG=72633
> TEST=net_unittests:*IDN* and base_unittests:*String*
> TBR=mark
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251213

TBR=mark@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=72633

Review URL: https://codereview.chromium.org/165593002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251214 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251214