Use the icu data file on Linux (but not on CrOS)

Set icu_use_data_file_flag to 1 for POSIX (other than Mac/iOS/Android). 

Mac and Android will be handled in a separate CL. 

This has to wait until https://codereview.chromium.org/111723007/ is rolled in. 
(done by https://codereview.chromium.org/118313004/ )

BUG=72633
TEST=All linux builds go through and all tests pass and there's no perf (start-up etc) regression.

Review URL: https://codereview.chromium.org/102413007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246678 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246678
[chromedriver] Remove downloaded chrome snapshots from /tmp.

BUG=None
R=chrisgao@chromium.org

Review URL: https://codereview.chromium.org/145153003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246679 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246679
[GCM] Disable leaky tests

gcm_unit_tests fails on linux_asan. See bug.

R=jianli@chromium.org
TBR=jianli@chromium.org
BUG=337560

Review URL: https://codereview.chromium.org/145783003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246680 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246680