gmock, gtest: upgraded packages to upstream

[This is a reland of a previous change that got reverted due
 to a python ebuild bug which has since been fixed.]

Upgraded dev-cpp/gmock to version 1.6.0 on amd64, arm, x86
Upgraded dev-cpp/gtest to version 1.6.0-r1 on amd64, arm, x86

gmock includes a patch for a mutex deadlock during destruction:
https://code.google.com/p/googlemock/issues/detail?id=79

BUG=chromium:211445
TEST=cbuildbot --remote -g  {x86,amd64,arm}-generic-full
CQ-DEPEND=CL:47572
CQ-DEPEND=CL:47573

Change-Id: I33c576dab5285322a677802309115aa4822bdc86
Reviewed-on: https://gerrit.chromium.org/gerrit/47574
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Gaurav Shah <gauravsh@chromium.org>
Tested-by: Gaurav Shah <gauravsh@chromium.org>
16 files changed