Revert of Revert of Revert of Turn on icu_use_data_file_flag on CrOS (https://codereview.chromium.org/164333003/)

Reason for revert:
CrOS-side change (chromeos-chrome.ebuild) may not be used by a buildbot.  

./1_autotest_tests/results-27-experimental_login_OwnershipNotRetaken/login_OwnershipNotRetaken/sysinfo/var/log/ui/ui.LATEST still has 

[0214/002103:FATAL:content_main_runner.cc(735)] Check failed: base::i18n::InitializeICU()

Original issue's description:
> Revert of Revert of Turn on icu_use_data_file_flag on CrOS (https://codereview.chromium.org/165593002/)
> 
> Reason for revert:
> https://chromium-review.googlesource.com/#/c/185937/ just got landed and this CL can go in now. 
> 
> Original issue's description:
> > 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
> > 
> > Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251214
> 
> TBR=mark@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=72633
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251220

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

Review URL: https://codereview.chromium.org/163173003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251276 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251276