Remove lazy CoreAnimation initialization

This was originally added to work around startup time regressions
by dynamically enabling CoreAnimation when overlapping views were
enabled. CoreAnimation will be enabled for all renderers at all times,
so this can be removed.

Remove the --use-core-animation=disabled mechanism of disabling
CoreAnimation. When enabled, the --use-core-animation flag will be
replace by a --disable-core-animation flag.

BUG=245900

Review URL: https://codereview.chromium.org/143823007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246223 0039d316-1c4b-4281-b951-d872f2087c98
Add new method SigninManagerBase::GetAuthenticatedAccountId() that replaces
ProfileOAuth2TokenService::GetPrimaryAccountId().  No code calls this new
method yet.  In follow up CL, I will replace all callers of the latter to
the former, then remove ProfileOAuth2TokenService::GetPrimaryAccountId()
completely.

BUG=333995

Review URL: https://codereview.chromium.org/144143004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246224 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246224
Update nss_revision to r246067.

Includes the following CLs:

Update third_party/nss to 3.15.5 Beta 2.
https://codereview.chromium.org/133273035/

R=agl@chromium.org,rsleevi@chromium.org
BUG=331625
TEST=none

Review URL: https://codereview.chromium.org/144203003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246225 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246226 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246226