Moves transient stacking logic into WindowStackingClient

This is part of moving transient window logic out of Window.

BUG=none
TEST=covered by tests
R=ben@chromium.org

Review URL: https://codereview.chromium.org/103813006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240440 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240440
Roll breakpad DEPS to r1256.

Bring in the capability to reset the Breakpad configuration to initial state on
iOS.

r1254: Address additional comments from r1248. Fix the register to check and
       fix some style nits.
r1255: disable unittests under ASAN that use memory crashes
r1256: Add -[BreakpadController resetConfiguration] for iOS.

BUG=326292

Review URL: https://codereview.chromium.org/105873005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240441 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240442 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240442