Roll grit from r147 to r148

This includes the following change:
Strip IDS_ as well as IDR_ in the chrome_messages_json generator.

Review URL: https://codereview.chromium.org/131343006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246769 0039d316-1c4b-4281-b951-d872f2087c98
Add strictness to Schema::Validate()

WIP

BUG=258339

Review URL: https://codereview.chromium.org/134153005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246770 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246771 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246771
[Telemetry] Require python 2.7.

Initial tests seem to indicate we have 2.7 everywhere we care about.
Let's make certain.

BUG=

Review URL: https://codereview.chromium.org/143823017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246772 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246772